Re: [PATCH] makedumpfile: request the kernel do page scans

From: HATAYAMA Daisuke
Date: Sun Dec 09 2012 - 20:01:47 EST

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From: Cliff Wickman <cpw@xxxxxxx>
Subject: Re: [PATCH] makedumpfile: request the kernel do page scans
Date: Mon, 19 Nov 2012 12:07:10 -0600

> On Fri, Nov 16, 2012 at 03:39:44PM -0500, Vivek Goyal wrote:
>> On Thu, Nov 15, 2012 at 04:52:40PM -0600, Cliff Wickman wrote:
>> >
>> > Gentlemen,
>> >
>> > I know this is rather late to the game, given all the recent work to speed
>> > up makedumpfile and reduce the memory that it consumes.
>> > But I've been experimenting with asking the kernel to scan the page tables
>> > instead of reading all those page structures through /proc/vmcore.
>> >
>> > The results are rather dramatic -- if they weren't I would not presume to
>> > suggest such a radical path.
>> > On a small, idle UV system: about 4 sec. versus about 40 sec.
>> > On a 8TB UV the unnecessary page scan alone takes 4 minutes, vs. about 200 min
>> > through /proc/vmcore.
>> >
>> > I have not compared it to your version 1.5.1, so I don't know if your recent
>> > work provides similar speedups.
>>
>> I guess try 1.5.1-rc. IIUC, we had the logic of going through page tables
>> but that required one single bitmap to be present and in constrained
>> memory environment we will not have that.
>>
>> That's when this idea came up that scan portion of struct page range,
>> filter it, dump it and then move on to next range.
>>
>> Even after 1.5.1-rc if difference is this dramatic, that means we are
>> not doing something right in makedumpfile and it needs to be
>> fixed/optimized.
>>
>> But moving the logic to kernel does not make much sense to me at this
>> point of time untile and unless there is a good explanation that why
>> user space can't do a good job of what kernel is doing.
>
> I tested a patch in which makedumpfile does nothing but scan all the
> page structures using /proc/vmcore. It is simply reading each consecutive
> range of page structures in readmem() chunks of 512 structures. And doing
> nothing more than accumulating a hash total of the 'flags' field in each
> page (for a sanity check). On my test machine there are 6 blocks of page
> structures, totaling 12 million structures. This takes 31.1 'units of time'
> (I won't say seconds, as the speed of the clock seems to be way too fast in
> the crash kernel). If I increase the buffer size to 5120 structures: 31.0 units.
> At 51200 structures: 30.9. So buffer size has virtually no effect.
>
> I also request the kernel to do the same thing. Each of the 6 requests
> asks the kernel to scan a range of page structures and accumulate a hash
> total of the 'flags' field. (And also copy a 10000-element pfn list back
> to user space, to test that such copies don't add significant overhead.)
> And the 12 million pages are scanned in 1.6 'units of time'.
>
> If I compare the time for actual page scanning (unnecessary pages and
> free pages) through /proc/vmcore vs. requesting the kernel to do the
> scanning: 40 units vs. 3.8 units.
>
> My conclusion is that makedumpfile's page scanning procedure is extremely
> dominated by the overhead of copying page structures through /proc/vmcore.
> And that is about 20x slower than using the kernel to access pages.

I have not tested your patch set on the machine with 2TB due to
reservation problem, but I already tested it on my local machine with
32GB and saw big performance improvement.

I applied your patch set on makedumpfile v1.5.1-rc and added an option
-N not to dump pages to focus on scanning pages part only.

By this, while scanning pages in user-space took about 25 seconds,
scanning pages in kernel-space took about 1 second.

During the execution I profiled it using perf record/report and its
results are attached files.

>From this we can notice that current makedumpfile consumes large part
of execution time for ioremap and its related processing. copy_to_user
was less than 2% only relative to a whole processing.

Looking into the codes around read method of /proc/vmcore, its call
stack can be broken into as follows:

read_vmcore
read_from_oldmem
copy_oldmem_page

copy_oldmem_page reads the 1st kernel's memory *per page* using
ioremap_cache and after completing it, immediately unmaps the remapped
address using iounmap.

Because ioremap/iounmap is called *per page*, this number of calling
ioremap throught scanning a whole pages is unchanged even if
makedumpfile's cache size is changed. This seems consistent with
Cliff's explanation that increasing 512 entries of makedumpfile's
cache was meaningless.

I think the first step to address this issue is to introduce a kind of
cache in read_vmcore path to reduce the number of calling
ioremap/iounmap. Porting scanning logic into kernel-space should be
considered if it turns out not to work enough.

Thanks.
HATAYAMA, Daisuke
sadump: does not have partition header
sadump: read dump device as unknown format
sadump: unknown format
LOAD (0)
phys_start : 1000000
phys_end : 22f1000
virt_start : ffffffff81000000
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LOAD (3)
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LOAD (4)
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virt_start : ffff880100000000
virt_end : ffff880880000000
Linux kdump
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page_size : 4096

max_mapnr : 880000

Buffer size for the cyclic mode: 2228224

num of NODEs : 4

Memory type : SPARSEMEM_EX

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mem_map (267)
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mem_map
Excluding unnecessary pages : [ 0 %]
Excluding unnecessary pages : [ 3 %]
Excluding unnecessary pages : [ 17 %]
Excluding unnecessary pages : [ 26 %]
Excluding unnecessary pages : [ 34 %]
Excluding unnecessary pages : [ 42 %]
Excluding unnecessary pages : [ 50 %]
Excluding unnecessary pages : [ 59 %]
Excluding unnecessary pages : [ 67 %]
Excluding unnecessary pages : [ 75 %]
Excluding unnecessary pages : [ 84 %]
Excluding unnecessary pages : [ 92 %]
Excluding unnecessary pages : [100 %]
Excluding unnecessary pages : [ 0 %]
Excluding unnecessary pages : [ 13 %]
Excluding unnecessary pages : [ 22 %]
Excluding unnecessary pages : [ 30 %]
Excluding unnecessary pages : [ 38 %]
Excluding unnecessary pages : [ 47 %]
Excluding unnecessary pages : [ 55 %]
Excluding unnecessary pages : [ 63 %]
Excluding unnecessary pages : [ 71 %]
Excluding unnecessary pages : [ 80 %]
Excluding unnecessary pages : [ 88 %]
Excluding unnecessary pages : [ 96 %]
Excluding unnecessary pages : [100 %]
(268)
mem_map : ffffea001d500000
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pfn_end : 868000
mem_map (269)
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mem_map (270)
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mem_map (271)
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STEP [Excluding unnecessary pages] : 11.224292 seconds
STEP [Excluding unnecessary pages] : 11.250834 seconds
STEP [Copying data ] : 11.407836 seconds
Writing erase info...
offset_eraseinfo: 6c0eb8, size_eraseinfo: 0

Original pages : 0x00000000007ec289
Excluded pages : 0x00000000007b9efb
Pages filled with zero : 0x0000000000000000
Cache pages : 0x0000000000012cff
Cache pages + private : 0x0000000000012015
User process data pages : 0x0000000000001ece
Free pages : 0x0000000000793319
Remaining pages : 0x000000000003238e
(The number of pages is reduced to 2%.)
Memory Hole : 0x0000000000093d77
--------------------------------------------------
Total pages : 0x0000000000880000

The dumpfile is saved to /mnt///127.0.0.1-2012-12-07-16:45:20/vmcore-empty-1.

makedumpfile Completed.
[ perf record: Woken up 55 times to write data ]
[ perf record: Captured and wrote 13.735 MB /mnt///127.0.0.1-2012-12-07-16:45:20/perf.data1 (~600084 samples) ]
sadump: does not have partition header
sadump: read dump device as unknown format
sadump: unknown format
LOAD (0)
phys_start : 1000000
phys_end : 22f1000
virt_start : ffffffff81000000
virt_end : ffffffff822f1000
LOAD (1)
phys_start : 10000
phys_end : 9b000
virt_start : ffff880000010000
virt_end : ffff88000009b000
LOAD (2)
phys_start : 100000
phys_end : 27000000
virt_start : ffff880000100000
virt_end : ffff880027000000
LOAD (3)
phys_start : 37000000
phys_end : 7b00d000
virt_start : ffff880037000000
virt_end : ffff88007b00d000
LOAD (4)
phys_start : 100000000
phys_end : 880000000
virt_start : ffff880100000000
virt_end : ffff880880000000
Linux kdump
page_size : 4096
page_size : 4096

max_mapnr : 880000

Buffer size for the cyclic mode: 2228224

num of NODEs : 4

Memory type : SPARSEMEM_EX

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mem_map (55)
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mem_map (56)
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mem_map (57)
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mem_map (58)
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mem_map (60)
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mem_map (63)
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mem_map (64)
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mem_map (65)
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mem_map (67)
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mem_map (70)
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mem_map (270)
mem_map : ffffea001d880000
pfn_start : 870000
pfn_end : 878000
mem_map (271)
mem_map : ffffea001da40000
pfn_start : 878000
pfn_end : 880000
STEP [Excluding unnecessary pages] : 0.438936 seconds
STEP [Excluding unnecessary pages] : 0.467304 seconds
STEP [Copying data ] : 0.624328 seconds
Writing erase info...
offset_eraseinfo: 6c0eb8, size_eraseinfo: 0

Original pages : 0x00000000007ec289
Excluded pages : 0x00000000007b9efb
Pages filled with zero : 0x0000000000000000
Cache pages : 0x0000000000012cff
Cache pages + private : 0x0000000000012015
User process data pages : 0x0000000000001ece
Free pages : 0x0000000000793319
Remaining pages : 0x000000000003238e
(The number of pages is reduced to 2%.)
Memory Hole : 0x0000000000093d77
--------------------------------------------------
Total pages : 0x0000000000880000

The dumpfile is saved to /mnt///127.0.0.1-2012-12-07-16:45:20/vmcore-empty-2.

makedumpfile Completed.
[ perf record: Woken up 3 times to write data ]
[ perf record: Captured and wrote 0.598 MB /mnt///127.0.0.1-2012-12-07-16:45:20/perf.data2 (~26144 samples) ]
Failed to open [ext4], continuing without symbols
No kallsyms or vmlinux with build-id a77a2293aab413880b8b361bb5b863a1680c8eab was found
[qla2xxx] with build id a77a2293aab413880b8b361bb5b863a1680c8eab not found, continuing without symbols
Failed to open [dm_mirror], continuing without symbols
No kallsyms or vmlinux with build-id 8e4a472eadb14fb0cde985ef8571b543880472dd was found
[megaraid_sas] with build id 8e4a472eadb14fb0cde985ef8571b543880472dd not found, continuing without symbols
No kallsyms or vmlinux with build-id 93346fc362be38e207aeaae310a339fb502d9acb was found
[jbd2] with build id 93346fc362be38e207aeaae310a339fb502d9acb not found, continuing without symbols
# ========
# captured on: Fri Dec 7 16:45:43 2012
# hostname : (none)
# os release : 3.7.0-rc8-cliff-bench+
# perf version : 3.7.rc8.3.ge0fb22
# arch : x86_64
# nrcpus online : 1
# nrcpus avail : 1
# cpudesc : Intel(R) Xeon(R) CPU E7- 4820 @ 2.00GHz
# cpuid : GenuineIntel,6,47,2
# total memory : 240104 kB
# cmdline : /var/crash/perf record -g -o /mnt///127.0.0.1-2012-12-07-16:45:20/perf.data1 /var/crash/makedumpfile-cliff --message-level 31 -i /var/crash/vmcoreinfo.txt -N -o -d 31 /proc/vmcore /mnt///127.0.0.1-2012-12-07-16:45:20/vmcore-empty-1
# event : name = cycles, type = 0, config = 0x0, config1 = 0x0, config2 = 0x0, excl_usr = 0, excl_kern = 0, excl_host = 0, excl_guest = 1, precise_ip = 0, id = { 2 }
# HEADER_CPU_TOPOLOGY info available, use -I to display
# HEADER_NUMA_TOPOLOGY info available, use -I to display
# pmu mappings: cpu = 4, software = 1, tracepoint = 2, uncore_bbox_0 = 15, uncore_bbox_1 = 16, uncore_cbox_0 = 7, uncore_cbox_1 = 8, uncore_cbox_2 = 9, uncore_cbox_3 = 10, uncore_cbox_4 = 11, uncore_cbox_5 = 12, uncore_cbox_6 = 13, uncore_cbox_7 = 14, uncore_mbox_0 = 19, uncore_mbox_1 = 20, uncore_rbox_0 = 21, uncore_rbox_1 = 22, uncore_sbox_0 = 17, uncore_sbox_1 = 18, breakpoint = 5, uncore_ubox = 6, uncore_wbox = 23
# ========
#
# Samples: 91K of event 'cycles'
# Event count (approx.): 23676246537
#
# Overhead Command Shared Object
# ........ ............... ....................
#
90.38% makedumpfile-cl [kernel.kallsyms]
|
|--19.73%-- __purge_vmap_area_lazy
| |
| |--80.50%-- free_vmap_area_noflush
| | free_unmap_vmap_area
| | remove_vm_area
| | iounmap
| | copy_oldmem_page
| | read_from_oldmem
| | read_vmcore
| | proc_reg_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __read_nocancel
| | |
| | |--66.59%-- 0x0
| | |
| | --33.41%-- 0x45524f4300000001
| |
| |--19.43%-- vm_unmap_aliases
| | change_page_attr_set_clr
| | _set_memory_wb
| | ioremap_change_attr
| | kernel_map_sync_memtype
| | __ioremap_caller
| | ioremap_cache
| | copy_oldmem_page
| | read_from_oldmem
| | read_vmcore
| | proc_reg_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __read_nocancel
| --0.07%-- [...]
|
|--15.58%-- try_preserve_large_page
| |
| |--99.97%-- __change_page_attr
| | __change_page_attr_set_clr
| | change_page_attr_set_clr
| | _set_memory_wb
| | ioremap_change_attr
| | kernel_map_sync_memtype
| | __ioremap_caller
| | ioremap_cache
| | copy_oldmem_page
| | read_from_oldmem
| | read_vmcore
| | proc_reg_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __read_nocancel
| --0.03%-- [...]
|
|--14.51%-- iomem_map_sanity_check
| |
| |--99.97%-- __ioremap_caller
| | ioremap_cache
| | copy_oldmem_page
| | read_from_oldmem
| | read_vmcore
| | proc_reg_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __read_nocancel
| | |
| | |--50.01%-- 0x6e6d2f0065726f63
| | |
| | --49.99%-- 0x45524f4300000001
| --0.03%-- [...]
|
|--11.06%-- walk_system_ram_range
| |
| |--64.71%-- pat_pagerange_is_ram
| | |
| | |--50.87%-- free_memtype
| | | iounmap
| | | copy_oldmem_page
| | | read_from_oldmem
| | | read_vmcore
| | | proc_reg_read
| | | vfs_read
| | | sys_read
| | | system_call_fastpath
| | | __read_nocancel
| | |
| | --49.13%-- reserve_memtype
| | __ioremap_caller
| | ioremap_cache
| | copy_oldmem_page
| | read_from_oldmem
| | read_vmcore
| | proc_reg_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __read_nocancel
| |
| |--34.75%-- page_is_ram
| | __ioremap_caller
| | ioremap_cache
| | copy_oldmem_page
| | read_from_oldmem
| | read_vmcore
| | proc_reg_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __read_nocancel
| --0.54%-- [...]
|
|--4.84%-- __phys_addr
| |
| |--52.48%-- __change_page_attr
| | __change_page_attr_set_clr
| | change_page_attr_set_clr
| | _set_memory_wb
| | ioremap_change_attr
| | kernel_map_sync_memtype
| | __ioremap_caller
| | ioremap_cache
| | copy_oldmem_page
| | read_from_oldmem
| | read_vmcore
| | proc_reg_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __read_nocancel
| |
| |--45.72%-- try_preserve_large_page
| | __change_page_attr
| | __change_page_attr_set_clr
| | change_page_attr_set_clr
| | _set_memory_wb
| | ioremap_change_attr
| | kernel_map_sync_memtype
| | __ioremap_caller
| | ioremap_cache
| | copy_oldmem_page
| | read_from_oldmem
| | read_vmcore
| | proc_reg_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __read_nocancel
| --1.80%-- [...]
|
|--4.82%-- __get_vm_area_node
| |
| |--99.70%-- get_vm_area_caller
| | __ioremap_caller
| | ioremap_cache
| | copy_oldmem_page
| | read_from_oldmem
| | read_vmcore
| | proc_reg_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __read_nocancel
| | |
| | --100.00%-- 0x0
| --0.30%-- [...]
|
|--4.13%-- iounmap
| |
| |--99.59%-- copy_oldmem_page
| | read_from_oldmem
| | read_vmcore
| | proc_reg_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __read_nocancel
| | |
| | |--50.39%-- 0x45524f4300000001
| | |
| | --49.61%-- 0x0
| --0.41%-- [...]
|
|--3.60%-- read_vmcore
| |
| |--99.83%-- proc_reg_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __read_nocancel
| --0.17%-- [...]
|
|--2.24%-- copy_user_generic_string
| read_from_oldmem
| read_vmcore
| proc_reg_read
| vfs_read
| sys_read
| system_call_fastpath
| __read_nocancel
|
|--1.92%-- remove_vm_area
| |
| |--99.31%-- iounmap
| | copy_oldmem_page
| | read_from_oldmem
| | read_vmcore
| | proc_reg_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __read_nocancel
| | |
| | --100.00%-- 0x0
| |
| --0.69%-- copy_oldmem_page
| read_from_oldmem
| read_vmcore
| proc_reg_read
| vfs_read
| sys_read
| system_call_fastpath
| __read_nocancel
|
|--1.82%-- do_kernel_range_flush
| |
| |--99.20%-- on_each_cpu
| | flush_tlb_kernel_range
| | __purge_vmap_area_lazy
| | free_vmap_area_noflush
| | free_unmap_vmap_area
| | remove_vm_area
| | iounmap
| | copy_oldmem_page
| | read_from_oldmem
| | read_vmcore
| | proc_reg_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __read_nocancel
| |
| --0.80%-- flush_tlb_kernel_range
| __purge_vmap_area_lazy
| free_vmap_area_noflush
| free_unmap_vmap_area
| remove_vm_area
| iounmap
| copy_oldmem_page
| read_from_oldmem
| read_vmcore
| proc_reg_read
| vfs_read
| sys_read
| system_call_fastpath
| __read_nocancel
|
|--1.01%-- rbt_memtype_erase
| |
| |--96.66%-- free_memtype
| | iounmap
| | copy_oldmem_page
| | read_from_oldmem
| | read_vmcore
| | proc_reg_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __read_nocancel
| |
| --3.34%-- iounmap
| copy_oldmem_page
| read_from_oldmem
| read_vmcore
| proc_reg_read
| vfs_read
| sys_read
| system_call_fastpath
| __read_nocancel
|
|--0.87%-- kfree
| |
| |--55.52%-- free_memtype
| | iounmap
| | copy_oldmem_page
| | read_from_oldmem
| | read_vmcore
| | proc_reg_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __read_nocancel
| |
| |--29.00%-- iounmap
| | copy_oldmem_page
| | read_from_oldmem
| | read_vmcore
| | proc_reg_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __read_nocancel
| |
| |--12.42%-- rcu_do_batch
| | __rcu_process_callbacks
| | rcu_process_callbacks
| | __do_softirq
| | call_softirq
| | do_softirq
| | irq_exit
| | smp_apic_timer_interrupt
| | apic_timer_interrupt
| | |
| | |--20.23%-- free_vmap_area_noflush
| | | free_unmap_vmap_area
| | | remove_vm_area
| | | iounmap
| | | copy_oldmem_page
| | | read_from_oldmem
| | | read_vmcore
| | | proc_reg_read
| | | vfs_read
| | | sys_read
| | | system_call_fastpath
| | | __read_nocancel
| | |
| | |--19.11%-- __ioremap_caller
| | | ioremap_cache
| | | copy_oldmem_page
| | | read_from_oldmem
| | | read_vmcore
| | | proc_reg_read
| | | vfs_read
| | | sys_read
| | | system_call_fastpath
| | | __read_nocancel
| | |
| | |--16.82%-- __change_page_attr
| | | __change_page_attr_set_clr
| | | change_page_attr_set_clr
| | | _set_memory_wb
| | | ioremap_change_attr
| | | kernel_map_sync_memtype
| | | __ioremap_caller
| | | ioremap_cache
| | | copy_oldmem_page
| | | read_from_oldmem
| | | read_vmcore
| | | proc_reg_read
| | | vfs_read
| | | sys_read
| | | system_call_fastpath
| | | __read_nocancel
| | |
| | |--6.75%-- pat_pagerange_is_ram
| | | |
| | | |--66.67%-- reserve_memtype
| | | | __ioremap_caller
| | | | ioremap_cache
| | | | copy_oldmem_page
| | | | read_from_oldmem
| | | | read_vmcore
| | | | proc_reg_read
| | | | vfs_read
| | | | sys_read
| | | | system_call_fastpath
| | | | __read_nocancel
| | | |
| | | --33.33%-- free_memtype
| | | iounmap
| | | copy_oldmem_page
| | | read_from_oldmem
| | | read_vmcore
| | | proc_reg_read
| | | vfs_read
| | | sys_read
| | | system_call_fastpath
| | | __read_nocancel
| | |
| | |--5.62%-- vm_unmap_aliases
| | | change_page_attr_set_clr
| | | _set_memory_wb
| | | ioremap_change_attr
| | | kernel_map_sync_memtype
| | | __ioremap_caller
| | | ioremap_cache
| | | copy_oldmem_page
| | | read_from_oldmem
| | | read_vmcore
| | | proc_reg_read
| | | vfs_read
| | | sys_read
| | | system_call_fastpath
| | | __read_nocancel
| | |
| | |--4.50%-- proc_reg_read
| | | vfs_read
| | | sys_read
| | | system_call_fastpath
| | | __read_nocancel
| | |
| | |--4.49%-- copy_oldmem_page
| | | read_from_oldmem
| | | read_vmcore
| | | proc_reg_read
| | | vfs_read
| | | sys_read
| | | system_call_fastpath
| | | __read_nocancel
| | |
| | |--3.37%-- get_vm_area_caller
| | | __ioremap_caller
| | | ioremap_cache
| | | copy_oldmem_page
| | | read_from_oldmem
| | | read_vmcore
| | | proc_reg_read
| | | vfs_read
| | | sys_read
| | | system_call_fastpath
| | | __read_nocancel
| | |
| | |--3.37%-- readmem
| | |
| | |--2.25%-- page_is_ram
| | | __ioremap_caller
| | | ioremap_cache
| | | copy_oldmem_page
| | | read_from_oldmem
| | | read_vmcore
| | | proc_reg_read
| | | vfs_read
| | | sys_read
| | | system_call_fastpath
| | | __read_nocancel
| | |
| | |--2.25%-- __exclude_unnecessary_pages
| | | exclude_unnecessary_pages_cyclic
| | | writeout_dumpfile
| | | 0x7fff6c26de6d
| | | 0x64656b616d2f6873
| | |
| | |--2.25%-- paddr_to_offset
| | | exclude_unnecessary_pages_cyclic
| | | |
| | | --100.00%-- writeout_dumpfile
| | | 0x7fff6c26de6d
| | | 0x64656b616d2f6873
| | |
| | |--1.13%-- try_preserve_large_page
| | | __change_page_attr
| | | __change_page_attr_set_clr
| | | change_page_attr_set_clr
| | | _set_memory_wb
| | | ioremap_change_attr
| | | kernel_map_sync_memtype
| | | __ioremap_caller
| | | ioremap_cache
| | | copy_oldmem_page
| | | read_from_oldmem
| | | read_vmcore
| | | proc_reg_read
| | | vfs_read
| | | sys_read
| | | system_call_fastpath
| | | __read_nocancel
| | |
| | |--1.12%-- reserve_memtype
| | | __ioremap_caller
| | | ioremap_cache
| | | copy_oldmem_page
| | | read_from_oldmem
| | | read_vmcore
| | | proc_reg_read
| | | vfs_read
| | | sys_read
| | | system_call_fastpath
| | | __read_nocancel
| | |
| | |--1.12%-- __lseek_nocancel
| | |
| | |--1.12%-- proc_reg_llseek
| | | vfs_llseek
| | | sys_lseek
| | | system_call_fastpath
| | | __lseek_nocancel
| | |
| | |--1.12%-- free_memtype
| | | iounmap
| | | copy_oldmem_page
| | | read_from_oldmem
| | | read_vmcore
| | | proc_reg_read
| | | vfs_read
| | | sys_read
| | | system_call_fastpath
| | | __read_nocancel
| | |
| | |--1.12%-- on_each_cpu
| | | flush_tlb_kernel_range
| | | __purge_vmap_area_lazy
| | | free_vmap_area_noflush
| | | free_unmap_vmap_area
| | | remove_vm_area
| | | iounmap
| | | copy_oldmem_page
| | | read_from_oldmem
| | | read_vmcore
| | | proc_reg_read
| | | vfs_read
| | | sys_read
| | | system_call_fastpath
| | | __read_nocancel
| | |
| | |--1.12%-- __get_vm_area_node
| | | get_vm_area_caller
| | | __ioremap_caller
| | | ioremap_cache
| | | copy_oldmem_page
| | | read_from_oldmem
| | | read_vmcore
| | | proc_reg_read
| | | vfs_read
| | | sys_read
| | | system_call_fastpath
| | | __read_nocancel
| | |
| | --1.12%-- vtop4_x86_64
| |
| |--2.09%-- copy_oldmem_page
| | read_from_oldmem
| | read_vmcore
| | proc_reg_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __read_nocancel
| |
| --0.98%-- __rcu_process_callbacks
| rcu_process_callbacks
| __do_softirq
| call_softirq
| do_softirq
| irq_exit
| smp_apic_timer_interrupt
| apic_timer_interrupt
| |
| |--57.11%-- __change_page_attr
| | __change_page_attr_set_clr
| | change_page_attr_set_clr
| | _set_memory_wb
| | ioremap_change_attr
| | kernel_map_sync_memtype
| | __ioremap_caller
| | ioremap_cache
| | copy_oldmem_page
| | read_from_oldmem
| | read_vmcore
| | proc_reg_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __read_nocancel
| |
| |--14.30%-- flush_tlb_kernel_range
| | __purge_vmap_area_lazy
| | free_vmap_area_noflush
| | free_unmap_vmap_area
| | remove_vm_area
| | iounmap
| | copy_oldmem_page
| | read_from_oldmem
| | read_vmcore
| | proc_reg_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __read_nocancel
| |
| |--14.30%-- free_vmap_area_noflush
| | free_unmap_vmap_area
| | remove_vm_area
| | iounmap
| | copy_oldmem_page
| | read_from_oldmem
| | read_vmcore
| | proc_reg_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __read_nocancel
| |
| --14.30%-- copy_oldmem_page
| read_from_oldmem
| read_vmcore
| proc_reg_read
| vfs_read
| sys_read
| system_call_fastpath
| __read_nocancel
|
|--0.58%-- __insert_vmap_area
| |
| |--98.32%-- alloc_vmap_area
| | __get_vm_area_node
| | get_vm_area_caller
| | __ioremap_caller
| | ioremap_cache
| | copy_oldmem_page
| | read_from_oldmem
| | read_vmcore
| | proc_reg_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __read_nocancel
| |
| --1.68%-- __get_vm_area_node
| get_vm_area_caller
| __ioremap_caller
| ioremap_cache
| copy_oldmem_page
| read_from_oldmem
| read_vmcore
| proc_reg_read
| vfs_read
| sys_read
| system_call_fastpath
| __read_nocancel
|
|--0.57%-- kmem_cache_alloc_node_trace
| |
| |--55.58%-- __get_vm_area_node
| | get_vm_area_caller
| | __ioremap_caller
| | ioremap_cache
| | copy_oldmem_page
| | read_from_oldmem
| | read_vmcore
| | proc_reg_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __read_nocancel
| |
| |--41.85%-- alloc_vmap_area
| | __get_vm_area_node
| | get_vm_area_caller
| | __ioremap_caller
| | ioremap_cache
| | copy_oldmem_page
| | read_from_oldmem
| | read_vmcore
| | proc_reg_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __read_nocancel
| |
| --2.56%-- get_vm_area_caller
| __ioremap_caller
| ioremap_cache
| copy_oldmem_page
| read_from_oldmem
| read_vmcore
| proc_reg_read
| vfs_read
| sys_read
| system_call_fastpath
| __read_nocancel
|
|--0.54%-- vfs_read
| |
| |--98.21%-- sys_read
| | system_call_fastpath
| | __read_nocancel
| | |
| | --100.00%-- 0x0
| |
| --1.79%-- system_call_fastpath
| __read_nocancel
|
|--0.54%-- memtype_rb_check_conflict
| |
| |--95.54%-- rbt_memtype_check_insert
| | reserve_memtype
| | __ioremap_caller
| | ioremap_cache
| | copy_oldmem_page
| | read_from_oldmem
| | read_vmcore
| | proc_reg_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __read_nocancel
| |
| --4.46%-- reserve_memtype
| __ioremap_caller
| ioremap_cache
| copy_oldmem_page
| read_from_oldmem
| read_vmcore
| proc_reg_read
| vfs_read
| sys_read
| system_call_fastpath
| __read_nocancel
|
|--0.51%-- __mtrr_type_lookup
| |
| |--96.91%-- mtrr_type_lookup
| | reserve_memtype
| | __ioremap_caller
| | ioremap_cache
| | copy_oldmem_page
| | read_from_oldmem
| | read_vmcore
| | proc_reg_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __read_nocancel
| |
| --3.09%-- reserve_memtype
| __ioremap_caller
| ioremap_cache
| copy_oldmem_page
| read_from_oldmem
| read_vmcore
| proc_reg_read
| vfs_read
| sys_read
| system_call_fastpath
| __read_nocancel
--11.15%-- [...]

9.19% makedumpfile-cl makedumpfile-cliff
|
|--37.97%-- __exclude_unnecessary_pages
| exclude_unnecessary_pages_cyclic
| |
| --100.00%-- writeout_dumpfile
| 0x7fff6c26de6d
| 0x64656b616d2f6873
|
|--18.73%-- set_bitmap_cyclic
| |
| --100.00%-- exclude_unnecessary_pages_cyclic
| |
| --100.00%-- writeout_dumpfile
| 0x7fff6c26de6d
| 0x64656b616d2f6873
|
|--13.79%-- paddr_to_offset
| |
| --100.00%-- exclude_unnecessary_pages_cyclic
| |
| --100.00%-- writeout_dumpfile
| 0x7fff6c26de6d
| 0x64656b616d2f6873
|
|--4.71%-- readmem
| |
| --100.00%-- exclude_unnecessary_pages_cyclic
| writeout_dumpfile
| 0x7fff6c26de6d
| 0x64656b616d2f6873
|
|--4.12%-- get_num_dumpable_cyclic
|
|--2.90%-- is_in_same_page
|
|--2.66%-- page_is_buddy_v3
| exclude_unnecessary_pages_cyclic
| |
| --100.00%-- writeout_dumpfile
| 0x7fff6c26de6d
| 0x64656b616d2f6873
|
|--2.37%-- clear_bit_on_2nd_bitmap_for_kernel
| exclude_unnecessary_pages_cyclic
| |
| --100.00%-- writeout_dumpfile
| 0x7fff6c26de6d
| 0x64656b616d2f6873
|
|--2.35%-- create_1st_bitmap_cyclic
|
|--2.04%-- is_xen_memory
| |
| --100.00%-- exclude_unnecessary_pages_cyclic
| |
| --100.00%-- writeout_dumpfile
| 0x7fff6c26de6d
| 0x64656b616d2f6873
|
|--2.02%-- vtop4_x86_64
|
|--1.67%-- set_bit_on_1st_bitmap
|
|--1.53%-- clear_bit_on_2nd_bitmap
| exclude_unnecessary_pages_cyclic
| |
| --100.00%-- writeout_dumpfile
| 0x7fff6c26de6d
| 0x64656b616d2f6873
|
|--1.25%-- write_kdump_pages_and_bitmap_cyclic
| writeout_dumpfile
| 0x7fff6c26de6d
| 0x64656b616d2f6873
|
|--1.15%-- update_cyclic_region
|
|--0.66%-- vaddr_to_paddr_x86_64
--0.07%-- [...]

0.42% makedumpfile-cl libc.so.6
|
|--40.25%-- __lseek_nocancel
|
|--36.91%-- __read_nocancel
|
|--8.64%-- __GI___libc_read
|
|--5.01%-- __memset_sse2
| |
| --100.00%-- 0x7fff6c26de6d
| 0x64656b616d2f6873
|
|--3.90%-- __GI___libc_lseek64
|
|--3.72%-- memcpy
| |
| --100.00%-- writeout_dumpfile
| 0x7fff6c26de6d
| 0x64656b616d2f6873
|
|--0.53%-- memchr
--1.04%-- [...]

0.01% makedumpfile-cl ld-linux-x86-64.so.2
|
|--49.69%-- strcmp
| |
| |--67.41%-- 0x8922974
| | 0x42494c4700342e33
| |
| --32.59%-- 0x9691a75
| 0x42494c4700352e32
|
|--17.46%-- _dl_name_match_p
| _dl_check_all_versions
|
|--16.51%-- do_lookup_x
|
--16.34%-- _dl_lookup_symbol_x
_dl_relocate_object
dl_main
_dl_sysdep_start
0x4156415741e58948

0.00% makedumpfile-cl libstdc++.so.6
|
--- 0x37282bb470
0x3728253b43
0x7fff6c26de6d
0x64656b616d2f6873

0.00% makedumpfile-cl [megaraid_sas]
|
--- megasas_isr
handle_irq_event_percpu
handle_irq_event
handle_edge_irq
handle_irq
do_IRQ
ret_from_intr
__exclude_unnecessary_pages
exclude_unnecessary_pages_cyclic
writeout_dumpfile
0x7fff6c26de6d
0x64656b616d2f6873

0.00% makedumpfile-cl [qla2xxx]
|
--- qla24xx_mbx_completion
qla24xx_msix_default
handle_irq_event_percpu
handle_irq_event
handle_edge_irq
handle_irq
do_IRQ
ret_from_intr
__change_page_attr
__change_page_attr_set_clr
change_page_attr_set_clr
_set_memory_wb
ioremap_change_attr
kernel_map_sync_memtype
__ioremap_caller
ioremap_cache
copy_oldmem_page
read_from_oldmem
read_vmcore
proc_reg_read
vfs_read
sys_read
system_call_fastpath
__read_nocancel

0.00% makedumpfile-cl [jbd2]
|
--- jbd2_journal_start
ext4_dirty_inode
__mark_inode_dirty
update_time
file_update_time
__generic_file_aio_write
generic_file_aio_write
ext4_file_write
do_sync_write
vfs_write
sys_write
system_call_fastpath
__write_nocancel
0xffffff0000003725

Failed to open [dm_mirror], continuing without symbols
Failed to open [ext4], continuing without symbols
# ========
# captured on: Fri Dec 7 16:45:46 2012
# hostname : (none)
# os release : 3.7.0-rc8-cliff-bench+
# perf version : 3.7.rc8.3.ge0fb22
# arch : x86_64
# nrcpus online : 1
# nrcpus avail : 1
# cpudesc : Intel(R) Xeon(R) CPU E7- 4820 @ 2.00GHz
# cpuid : GenuineIntel,6,47,2
# total memory : 240104 kB
# cmdline : /var/crash/perf record -g -o /mnt///127.0.0.1-2012-12-07-16:45:20/perf.data2 /var/crash/makedumpfile-cliff --message-level 31 -i /var/crash/vmcoreinfo.txt -N -d 31 /proc/vmcore /mnt///127.0.0.1-2012-12-07-16:45:20/vmcore-empty-2
# event : name = cycles, type = 0, config = 0x0, config1 = 0x0, config2 = 0x0, excl_usr = 0, excl_kern = 0, excl_host = 0, excl_guest = 1, precise_ip = 0, id = { 3 }
# HEADER_CPU_TOPOLOGY info available, use -I to display
# HEADER_NUMA_TOPOLOGY info available, use -I to display
# pmu mappings: cpu = 4, software = 1, tracepoint = 2, uncore_bbox_0 = 15, uncore_bbox_1 = 16, uncore_cbox_0 = 7, uncore_cbox_1 = 8, uncore_cbox_2 = 9, uncore_cbox_3 = 10, uncore_cbox_4 = 11, uncore_cbox_5 = 12, uncore_cbox_6 = 13, uncore_cbox_7 = 14, uncore_mbox_0 = 19, uncore_mbox_1 = 20, uncore_rbox_0 = 21, uncore_rbox_1 = 22, uncore_sbox_0 = 17, uncore_sbox_1 = 18, breakpoint = 5, uncore_ubox = 6, uncore_wbox = 23
# ========
#
# Samples: 5K of event 'cycles'
# Event count (approx.): 1493942335
#
# Overhead Command Shared Object
# ........ ............... ....................
#
51.45% makedumpfile-cl makedumpfile-cliff
|
|--51.45%-- set_bitmap_cyclic
| |
| --100.00%-- exclude_unnecessary_pages_cyclic
| |
| --100.00%-- writeout_dumpfile
| 0x7fff0b66fe70
| 0x64656b616d2f6873
|
|--11.66%-- get_num_dumpable_cyclic
|
|--7.96%-- clear_bit_on_2nd_bitmap_for_kernel
| exclude_unnecessary_pages_cyclic
| |
| --100.00%-- writeout_dumpfile
| 0x7fff0b66fe70
| 0x64656b616d2f6873
|
|--6.93%-- create_1st_bitmap_cyclic
|
|--4.52%-- __exclude_unnecessary_pages_kernel
| exclude_unnecessary_pages_cyclic
| |
| --100.00%-- writeout_dumpfile
| 0x7fff0b66fe70
| 0x64656b616d2f6873
|
|--4.35%-- clear_bit_on_2nd_bitmap
| exclude_unnecessary_pages_cyclic
| |
| --100.00%-- writeout_dumpfile
| 0x7fff0b66fe70
| 0x64656b616d2f6873
|
|--4.05%-- set_bit_on_1st_bitmap
|
|--3.63%-- update_cyclic_region
|
|--3.52%-- write_kdump_pages_and_bitmap_cyclic
| writeout_dumpfile
| 0x7fff0b66fe70
| 0x64656b616d2f6873
|
|--1.87%-- is_xen_memory
| exclude_unnecessary_pages_cyclic
| |
| --100.00%-- writeout_dumpfile
| 0x7fff0b66fe70
| 0x64656b616d2f6873
--0.07%-- [...]

47.68% makedumpfile-cl [kernel.kallsyms]
|
|--77.89%-- write_vmcore_get_excludes
| write_vmcore_pfn_lists
| proc_reg_write
| vfs_write
| sys_write
| system_call_fastpath
| __write_nocancel
| exclude_unnecessary_pages_cyclic
| |
| --100.00%-- writeout_dumpfile
| 0x7fff0b66fe70
| 0x64656b616d2f6873
|
|--15.34%-- walk_system_ram_range
| |
| |--96.92%-- page_is_ram
| | __ioremap_caller
| | ioremap_cache
| | |
| | |--99.51%-- write_vmcore_get_memmap
| | | write_vmcore_pfn_lists
| | | proc_reg_write
| | | vfs_write
| | | sys_write
| | | system_call_fastpath
| | | __write_nocancel
| | | 0x7fff0b66fe70
| | | 0x64656b616d2f6873
| | --0.49%-- [...]
| |
| |--2.84%-- pat_pagerange_is_ram
| | |
| | |--58.30%-- free_memtype
| | | iounmap
| | | copy_oldmem_page
| | | read_from_oldmem
| | | read_vmcore
| | | proc_reg_read
| | | vfs_read
| | | sys_read
| | | system_call_fastpath
| | | __read_nocancel
| | | |
| | | --100.00%-- 0x45524f4300000001
| | |
| | --41.70%-- reserve_memtype
| | __ioremap_caller
| | ioremap_cache
| | copy_oldmem_page
| | read_from_oldmem
| | read_vmcore
| | proc_reg_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __read_nocancel
| --0.24%-- [...]
|
|--0.76%-- __purge_vmap_area_lazy
| |
| |--76.20%-- free_vmap_area_noflush
| | free_unmap_vmap_area
| | remove_vm_area
| | iounmap
| | copy_oldmem_page
| | read_from_oldmem
| | read_vmcore
| | proc_reg_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __read_nocancel
| | |
| | |--50.02%-- 0x45524f4300000001
| | |
| | --49.98%-- 0x0
| |
| --23.80%-- vm_unmap_aliases
| change_page_attr_set_clr
| _set_memory_wb
| ioremap_change_attr
| kernel_map_sync_memtype
| __ioremap_caller
| ioremap_cache
| copy_oldmem_page
| read_from_oldmem
| read_vmcore
| proc_reg_read
| vfs_read
| sys_read
| system_call_fastpath
| __read_nocancel
|
|--0.66%-- iomem_map_sanity_check
| __ioremap_caller
| ioremap_cache
| copy_oldmem_page
| read_from_oldmem
| read_vmcore
| proc_reg_read
| vfs_read
| sys_read
| system_call_fastpath
| __read_nocancel
| |
| |--50.44%-- 0x45524f4300000001
| |
| --49.56%-- 0x0
|
|--0.51%-- try_preserve_large_page
| __change_page_attr
| __change_page_attr_set_clr
| change_page_attr_set_clr
| _set_memory_wb
| ioremap_change_attr
| kernel_map_sync_memtype
| __ioremap_caller
| ioremap_cache
| copy_oldmem_page
| read_from_oldmem
| read_vmcore
| proc_reg_read
| vfs_read
| sys_read
| system_call_fastpath
| __read_nocancel
--4.84%-- [...]

0.72% makedumpfile-cl libc.so.6
|
|--36.59%-- __memset_sse2
| |
| --100.00%-- 0x7fff0b66fe70
| 0x64656b616d2f6873
|
|--31.88%-- memcpy
| |
| --100.00%-- writeout_dumpfile
| 0x7fff0b66fe70
| 0x64656b616d2f6873
|
|--4.88%-- time
|
|--4.80%-- _IO_file_xsputn@@GLIBC_2.2.5
| 0x7f7e97029000
|
|--2.46%-- _IO_file_init@@GLIBC_2.2.5
|
|--2.45%-- _int_free
|
|--2.45%-- 0x372527ffa0
|
|--2.44%-- _IO_default_xsputn
| 0x71e4ef
|
|--2.42%-- __lseek_nocancel
|
|--2.41%-- _IO_getline_info
|
|--2.41%-- __strlen_sse42
| 0x61705f6769746e6f
|
|--2.41%-- _IO_fgets
| 0x3638343533313d45
|
--2.40%-- vfprintf
fprintf

0.13% makedumpfile-cl ld-linux-x86-64.so.2
|
|--28.61%-- _dl_relocate_object
| dl_main
| _dl_sysdep_start
| 0x4156415741e58948
|
|--28.61%-- do_lookup_x
|
|--14.96%-- strcmp
| 0x6e696c2d646c0036
|
|--14.34%-- _dl_lookup_symbol_x
| _dl_relocate_object
| dl_main
| _dl_sysdep_start
| 0x4156415741e58948
|
--13.48%-- _dl_sort_fini
_dl_fini
exit

0.02% makedumpfile-cl libstdc++.so.6
|
--- std::basic_ios<char, std::char_traits<char> >::init(std::basic_streambuf<char, std::char_traits<char> >*)
0x37284ebbe0
std::basic_ostream<char, std::char_traits<char> >::~basic_ostream()

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