RE: [EXT] Re: Ask help about this patch b951aaff5035 " mm: enable page allocation tagging"

[Carlos Song]

> -----Original Message-----
> From: Suren Baghdasaryan <surenb@xxxxxxxxxx>
> Sent: Thursday, March 20, 2025 11:50 PM
> To: Kent Overstreet <kent.overstreet@xxxxxxxxx>
> Cc: Carlos Song <carlos.song@xxxxxxx>; akpm@xxxxxxxxxxxxxxxxxxxx;
> willy@xxxxxxxxxxxxx; linux-mm@xxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> linux-fsdevel@xxxxxxxxxxxxxxx
> Subject: [EXT] Re: Ask help about this patch b951aaff5035 " mm: enable page
> allocation tagging"
>
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>
> On Thu, Mar 20, 2025 at 4:24 AM Kent Overstreet <kent.overstreet@xxxxxxxxx>
> wrote:
> >
> > On Thu, Mar 20, 2025 at 11:07:41AM +0000, Carlos Song wrote:
> > > Hi, all
> > >
> > > I found a 300ms~600ms IRQ off when writing 1Gb data to mmc device at
> I.MX7d SDB board at Linux-kernel-v6.14.
> > > But I test the same case at Linux-kernel-v6.7, this longest IRQ off time is only
> 1ms~2ms. So the issue is introduced from v6.7~v6.14.
> > >
> > > Run this cmd to test:
> > > dd if=/dev/zero of=/dev/mmcblk2p4 bs=4096 seek=12500 count=256000
> > > conv=fsync
> > >
> > > This issue looks from blkdev_buffered_write() function. Because when
> > > I run this cmd with "oflag=direct" to use blkdev_direct_write(), I can not see
> any long time IRQ off.
> > >
> > > Then I use Ftrace irqoff tracer to trace the longest IRQ off event, I found
> some differences between v6.7 and v6.14:
> > > In iomap_file_buffered_write(), __folio_alloc (in v6.7) is replaced by
> _folio_alloc_noprof (in v6.14) by this patch.
> > > The spinlock disabled IRQ ~300ms+. It looks there are some fixes for this
> patch, but I still can see IRQ off 300ms+ at 6.14.0-rc7-next-20250319.
>
> Do you have CONFIG_MEM_ALLOC_PROFILING enabled and if so, does the issue
> disappear if you disable CONFIG_MEM_ALLOC_PROFILING?
>
Sorry for my late reply and thank you for your quick reply!
We don't enable CONFIG_MEM_ALLOC_PROFILING in kernel.

> > >
> > > Do I trigger one bug? I know little about mem so I have to report it and hope
> I can get some help or guide.
> > > I put my ftrace log at the mail tail to help trace and explain.
> >
> > Did you track down which spinlock?
> >
> > >
> > > commit b951aaff503502a7fe066eeed2744ba8a6413c89
> > > Author: Suren Baghdasaryan
> surenb@xxxxxxxxxx<mailto:surenb@xxxxxxxxxx>
> > > Date:   Thu Mar 21 09:36:40 2024 -0700
> > >
> > >     mm: enable page allocation tagging
> > >
> > >     Redefine page allocators to record allocation tags upon their
> invocation.
> > >     Instrument post_alloc_hook and free_pages_prepare to modify
> current
> > >     allocation tag.
> > >
> > >     [surenb@xxxxxxxxxx: undo _noprof additions in the documentation]
> > >       Link:
> https://lkml.kern/
> el.org%2Fr%2F20240326231453.1206227-3-surenb%40google.com&data=05%
> 7C02%7Ccarlos.song%40nxp.com%7Cd28a491e16da40a24a6508dd67c6e95b%
> 7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C638780826228162008
> %7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMD
> AwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7
> C&sdata=jCoaXCuYC2cLtjSdHRJn73p0wrrtVc2I36Z16R1dsZI%3D&reserved=0
> > >     Link:
> https://lkml.kern/
> el.org%2Fr%2F20240321163705.3067592-19-surenb%40google.com&data=05
> %7C02%7Ccarlos.song%40nxp.com%7Cd28a491e16da40a24a6508dd67c6e95b
> %7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C63878082622817871
> 6%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuM
> DAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%
> 7C&sdata=6ey4%2BMmBB%2FEN%2FIwSrUaWhZFql%2BNYyuuqkW6mYe9weN
> k%3D&reserved=0
> > >     Signed-off-by: Suren Baghdasaryan
> surenb@xxxxxxxxxx<mailto:surenb@xxxxxxxxxx>
> > >     Co-developed-by: Kent Overstreet
> kent.overstreet@xxxxxxxxx<mailto:kent.overstreet@xxxxxxxxx>
> > >     Signed-off-by: Kent Overstreet
> kent.overstreet@xxxxxxxxx<mailto:kent.overstreet@xxxxxxxxx>
> > >     Reviewed-by: Kees Cook
> keescook@xxxxxxxxxxxx<mailto:keescook@xxxxxxxxxxxx>
> > >     Tested-by: Kees Cook
> keescook@xxxxxxxxxxxx<mailto:keescook@xxxxxxxxxxxx>
> > >     Cc: Alexander Viro
> viro@xxxxxxxxxxxxxxxxxx<mailto:viro@xxxxxxxxxxxxxxxxxx>
> > >     Cc: Alex Gaynor
> alex.gaynor@xxxxxxxxx<mailto:alex.gaynor@xxxxxxxxx>
> > >     Cc: Alice Ryhl aliceryhl@xxxxxxxxxx<mailto:aliceryhl@xxxxxxxxxx>
> > >     Cc: Andreas Hindborg
> a.hindborg@xxxxxxxxxxx<mailto:a.hindborg@xxxxxxxxxxx>
> > >     Cc: Benno Lossin
> benno.lossin@xxxxxxxxx<mailto:benno.lossin@xxxxxxxxx>
> > >     Cc: "Björn Roy Baron"
> bjorn3_gh@xxxxxxxxxxxxxx<mailto:bjorn3_gh@xxxxxxxxxxxxxx>
> > >     Cc: Boqun Feng
> boqun.feng@xxxxxxxxx<mailto:boqun.feng@xxxxxxxxx>
> > >     Cc: Christoph Lameter cl@xxxxxxxxx<mailto:cl@xxxxxxxxx>
> > >     Cc: Dennis Zhou dennis@xxxxxxxxxx<mailto:dennis@xxxxxxxxxx>
> > >     Cc: Gary Guo gary@xxxxxxxxxxx<mailto:gary@xxxxxxxxxxx>
> > >     Cc: Miguel Ojeda ojeda@xxxxxxxxxx<mailto:ojeda@xxxxxxxxxx>
> > >     Cc: Pasha Tatashin
> pasha.tatashin@xxxxxxxxxx<mailto:pasha.tatashin@xxxxxxxxxx>
> > >     Cc: Peter Zijlstra
> peterz@xxxxxxxxxxxxx<mailto:peterz@xxxxxxxxxxxxx>
> > >     Cc: Tejun Heo tj@xxxxxxxxxx<mailto:tj@xxxxxxxxxx>
> > >     Cc: Vlastimil Babka vbabka@xxxxxxx<mailto:vbabka@xxxxxxx>
> > >     Cc: Wedson Almeida Filho
> wedsonaf@xxxxxxxxx<mailto:wedsonaf@xxxxxxxxx>
> > >     Signed-off-by: Andrew Morton
> > > akpm@xxxxxxxxxxxxxxxxxxxx<mailto:akpm@xxxxxxxxxxxxxxxxxxxx>
> > >
> > >
> > > Ftrace irqoff tracer shows detail:
> > > At v6.14:
> > > # tracer: irqsoff
> > > #
> > > # irqsoff latency trace v1.1.5 on 6.14.0-rc7-next-20250319 #
> > > --------------------------------------------------------------------
> > > # latency: 279663 us, #21352/21352, CPU#0 | (M:NONE VP:0, KP:0, SP:0
> HP:0 #P:2)
> > > #    -----------------
> > > #    | task: dd-805 (uid:0 nice:0 policy:0 rt_prio:0)
> > > #    -----------------
> > > #  => started at: __rmqueue_pcplist
> > > #  => ended at:   _raw_spin_unlock_irqrestore
> > > #
> > > #
> > > #                    _------=> CPU#
> > > #                   / _-----=> irqs-off/BH-disabled
> > > #                  | / _----=> need-resched
> > > #                  || / _---=> hardirq/softirq
> > > #                  ||| / _--=> preempt-depth
> > > #                  |||| / _-=> migrate-disable
> > > #                  ||||| /     delay
> > > #  cmd     pid     |||||| time  |   caller
> > > #     \   /        ||||||  \    |    /
> > >       dd-805       0d....    1us : __rmqueue_pcplist
> > >       dd-805       0d....    3us : _raw_spin_trylock
> <-__rmqueue_pcplist
> > >       dd-805       0d....    7us : __mod_zone_page_state
> <-__rmqueue_pcplist
> > >       dd-805       0d....   10us : __mod_zone_page_state
> <-__rmqueue_pcplist
> > >       dd-805       0d....   12us : __mod_zone_page_state
> <-__rmqueue_pcplist
> > >       dd-805       0d....   15us : __mod_zone_page_state
> <-__rmqueue_pcplist
> > >       dd-805       0d....   17us : __mod_zone_page_state
> <-__rmqueue_pcplist
> > >       dd-805       0d....   19us : __mod_zone_page_state
> <-__rmqueue_pcplist
> > >    ...
> > >       dd-805       0d.... 1535us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-805       0d.... 1538us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-805       0d.... 1539us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-805       0d.... 1542us+: try_to_claim_block
> <-__rmqueue_pcplist
> > >       dd-805       0d.... 1597us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-805       0d.... 1599us+: try_to_claim_block
> <-__rmqueue_pcplist
> > >       dd-805       0d.... 1674us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-805       0d.... 1676us+: try_to_claim_block
> <-__rmqueue_pcplist
> > >       dd-805       0d.... 1716us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-805       0d.... 1718us+: try_to_claim_block
> <-__rmqueue_pcplist
> > >       dd-805       0d.... 1801us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-805       0d.... 1803us+: try_to_claim_block
> <-__rmqueue_pcplist
> > > ...
> > >      dd-805       0d.... 279555us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-805       0d.... 279556us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-805       0d.... 279558us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-805       0d.... 279560us+: try_to_claim_block
> <-__rmqueue_pcplist
> > >       dd-805       0d.... 279616us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-805       0d.... 279618us : __mod_zone_page_state
> <-__rmqueue_pcplist
> > >       dd-805       0d.... 279620us : find_suitable_fallback
> <-__rmqueue_pcplist
> > > ...
> > >       dd-805       0d.... 279658us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-805       0d.... 279660us : _raw_spin_unlock_irqrestore
> <-__rmqueue_pcplist
> > >       dd-805       0d.... 279662us : _raw_spin_unlock_irqrestore
> > >       dd-805       0d.... 279666us+: trace_hardirqs_on
> <-_raw_spin_unlock_irqrestore
> > >       dd-805       0d.... 279712us : <stack trace>
> > > => get_page_from_freelist
> > > => __alloc_frozen_pages_noprof
> > > => __folio_alloc_noprof
> > > => __filemap_get_folio
> > > => iomap_write_begin
> > > => iomap_file_buffered_write
> > > => blkdev_write_iter
> > > => vfs_write
> > > => ksys_write
> > > => ret_fast_syscall
> > >
> > > At v6.7:
> > > # tracer: irqsoff
> > > #
> > > # irqsoff latency trace v1.1.5 on 6.7.0 #
> > > --------------------------------------------------------------------
> > > # latency: 2477 us, #146/146, CPU#0 | (M:server VP:0, KP:0, SP:0 HP:0 #P:2)
> > > #    -----------------
> > > #    | task: dd-808 (uid:0 nice:0 policy:0 rt_prio:0)
> > > #    -----------------
> > > #  => started at: _raw_spin_lock_irqsave
> > > #  => ended at:   _raw_spin_unlock_irqrestore
> > > #
> > > #
> > > #                    _------=> CPU#
> > > #                   / _-----=> irqs-off/BH-disabled
> > > #                  | / _----=> need-resched
> > > #                  || / _---=> hardirq/softirq
> > > #                  ||| / _--=> preempt-depth
> > > #                  |||| / _-=> migrate-disable
> > > #                  ||||| /     delay
> > > #  cmd     pid     |||||| time  |   caller
> > > #     \   /        ||||||  \    |    /
> > >       dd-808       0d....    1us!: _raw_spin_lock_irqsave
> > >       dd-808       0d....  186us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  189us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  191us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  192us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  194us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  196us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  199us : steal_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  203us!: move_freepages_block
> <-steal_suitable_fallback
> > >       dd-808       0d....  330us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  332us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  334us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  336us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  338us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  339us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  341us : steal_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  343us!: move_freepages_block
> <-steal_suitable_fallback
> > >       dd-808       0d....  479us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  481us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  483us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  485us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  486us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  488us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  490us : steal_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  492us!: move_freepages_block
> <-steal_suitable_fallback
> > >       dd-808       0d....  630us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  632us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  634us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  636us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  638us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  640us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  642us : steal_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  644us!: move_freepages_block
> <-steal_suitable_fallback
> > >       dd-808       0d....  771us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  773us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  775us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  777us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  778us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  780us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  782us : steal_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  784us!: move_freepages_block
> <-steal_suitable_fallback
> > >       dd-808       0d....  911us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  913us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  915us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  916us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  918us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  920us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  922us : steal_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d....  924us!: move_freepages_block
> <-steal_suitable_fallback
> > >       dd-808       0d.... 1055us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1058us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1059us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1061us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1063us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1065us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1066us : steal_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1068us!: move_freepages_block
> <-steal_suitable_fallback
> > >       dd-808       0d.... 1194us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1196us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1198us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1200us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1202us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1203us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1205us : steal_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1208us!: move_freepages_block
> <-steal_suitable_fallback
> > >       dd-808       0d.... 1333us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1335us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1337us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1339us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1341us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1342us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1344us : steal_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1346us!: move_freepages_block
> <-steal_suitable_fallback
> > >       dd-808       0d.... 1480us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1482us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1484us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1486us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1488us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1490us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1492us : steal_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1494us!: move_freepages_block
> <-steal_suitable_fallback
> > >       dd-808       0d.... 1621us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1623us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1625us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1627us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1629us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1630us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1632us : steal_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1634us!: move_freepages_block
> <-steal_suitable_fallback
> > >       dd-808       0d.... 1761us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1763us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1765us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1766us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1768us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1770us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1772us : steal_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1774us!: move_freepages_block
> <-steal_suitable_fallback
> > >       dd-808       0d.... 1900us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1902us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1903us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1905us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1907us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1909us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1911us : steal_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 1913us!: move_freepages_block
> <-steal_suitable_fallback
> > >       dd-808       0d.... 2038us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2040us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2042us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2044us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2046us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2047us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2049us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2051us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2053us : steal_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2055us!: move_freepages_block
> <-steal_suitable_fallback
> > >       dd-808       0d.... 2175us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2176us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2178us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2180us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2182us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2183us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2185us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2187us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2189us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2191us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2192us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2194us : steal_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2196us!: move_freepages_block
> <-steal_suitable_fallback
> > >       dd-808       0d.... 2323us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2325us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2327us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2328us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2330us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2332us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2334us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2335us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2337us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2339us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2341us : find_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2343us : steal_suitable_fallback
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2345us!: move_freepages_block
> <-steal_suitable_fallback
> > >       dd-808       0d.... 2470us : __mod_zone_page_state
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2473us : _raw_spin_unlock_irqrestore
> <-__rmqueue_pcplist
> > >       dd-808       0d.... 2476us : _raw_spin_unlock_irqrestore
> > >       dd-808       0d.... 2479us+: tracer_hardirqs_on
> <-_raw_spin_unlock_irqrestore
> > >       dd-808       0d.... 2520us : <stack trace>
> > > => get_page_from_freelist
> > > => __alloc_pages
> > > => __folio_alloc
> > > => __filemap_get_folio
> > > => iomap_write_begin
> > > => iomap_file_buffered_write
> > > => blkdev_write_iter
> > > => vfs_write
> > > => ksys_write
> > > => ret_fast_syscall
> > >
> > > Best Regard
> > > Carlos Song
> > >