[PATCH v5 0/3] perf record: adapt NUMA awareness to machines with #CPUs > 1K

From: Alexey Budankov
Date: Tue Dec 03 2019 - 06:41:44 EST


Current implementation of cpu_set_t type by glibc has internal cpu
mask size limitation of no more than 1024 CPUs. This limitation confines
NUMA awareness of Perf tool in record mode, thru --affinity option,
to the first 1024 CPUs on machines with larger amount of CPUs.

This patch set enables Perf tool to overcome 1024 CPUs limitation by
using a dedicated struct mmap_cpu_mask type and applying tool's bitmap
API operations to manipulate affinity masks of the tool's thread and
the mmaped data buffers.

tools bitmap API has been extended with bitmap_free() function and
bitmap_equal() operation whose implementation is derived from the
kernel one.

---
Changes in v5:
- avoided allocation of mmap affinity masks in case of
rec->opts.affinity == PERF_AFFINITY_SYS
Changes in v4:
- renamed perf_mmap__print_cpu_mask() to mmap_cpu_mask__scnprintf()
- avoided checking mask bits for NULL prior calling bitmask_free()
- avoided thread affinity mask allocation for case of
rec->opts.affinity == PERF_AFFINITY_SYS
Changes in v3:
- implemented perf_mmap__print_cpu_mask() function
- use perf_mmap__print_cpu_mask() to log thread and mmap cpus masks
when verbose level is equal to 2
Changes in v2:
- implemented bitmap_free() for symmetry with bitmap_alloc()
- capitalized MMAP_CPU_MASK_BYTES() macro
- returned -1 from perf_mmap__setup_affinity_mask()
- implemented releasing of masks using bitmap_free()
- moved debug printing under -vv option

---
Alexey Budankov (3):
tools bitmap: implement bitmap_equal() operation at bitmap API
perf mmap: declare type for cpu mask of arbitrary length
perf record: adapt affinity to machines with #CPUs > 1K

tools/include/linux/bitmap.h | 30 +++++++++++++++++++++++++++
tools/lib/bitmap.c | 15 ++++++++++++++
tools/perf/builtin-record.c | 28 +++++++++++++++++++------
tools/perf/util/mmap.c | 40 ++++++++++++++++++++++++++++++------
tools/perf/util/mmap.h | 13 +++++++++++-
5 files changed, 113 insertions(+), 13 deletions(-)

---
Validation:

# tools/perf/perf record -vv -- ls
Using CPUID GenuineIntel-6-5E-3
intel_pt default config: tsc,mtc,mtc_period=3,psb_period=3,pt,branch
nr_cblocks: 0
affinity: SYS
mmap flush: 1
comp level: 0
------------------------------------------------------------
perf_event_attr:
size 120
{ sample_period, sample_freq } 4000
sample_type IP|TID|TIME|PERIOD
read_format ID
disabled 1
inherit 1
mmap 1
comm 1
freq 1
enable_on_exec 1
task 1
precise_ip 3
sample_id_all 1
exclude_guest 1
mmap2 1
comm_exec 1
ksymbol 1
bpf_event 1
------------------------------------------------------------
sys_perf_event_open: pid 23718 cpu 0 group_fd -1 flags 0x8 = 4
sys_perf_event_open: pid 23718 cpu 1 group_fd -1 flags 0x8 = 5
sys_perf_event_open: pid 23718 cpu 2 group_fd -1 flags 0x8 = 6
sys_perf_event_open: pid 23718 cpu 3 group_fd -1 flags 0x8 = 9
sys_perf_event_open: pid 23718 cpu 4 group_fd -1 flags 0x8 = 10
sys_perf_event_open: pid 23718 cpu 5 group_fd -1 flags 0x8 = 11
sys_perf_event_open: pid 23718 cpu 6 group_fd -1 flags 0x8 = 12
sys_perf_event_open: pid 23718 cpu 7 group_fd -1 flags 0x8 = 13
mmap size 528384B
0x7f3e06e060b8: mmap mask[8]:
0x7f3e06e16180: mmap mask[8]:
0x7f3e06e26248: mmap mask[8]:
0x7f3e06e36310: mmap mask[8]:
0x7f3e06e463d8: mmap mask[8]:
0x7f3e06e564a0: mmap mask[8]:
0x7f3e06e66568: mmap mask[8]:
0x7f3e06e76630: mmap mask[8]:
------------------------------------------------------------
perf_event_attr:
type 1
size 120
config 0x9
watermark 1
sample_id_all 1
bpf_event 1
{ wakeup_events, wakeup_watermark } 1
------------------------------------------------------------
sys_perf_event_open: pid -1 cpu 0 group_fd -1 flags 0x8 = 14
sys_perf_event_open: pid -1 cpu 1 group_fd -1 flags 0x8 = 15
sys_perf_event_open: pid -1 cpu 2 group_fd -1 flags 0x8 = 16
sys_perf_event_open: pid -1 cpu 3 group_fd -1 flags 0x8 = 17
sys_perf_event_open: pid -1 cpu 4 group_fd -1 flags 0x8 = 18
sys_perf_event_open: pid -1 cpu 5 group_fd -1 flags 0x8 = 19
sys_perf_event_open: pid -1 cpu 6 group_fd -1 flags 0x8 = 20
sys_perf_event_open: pid -1 cpu 7 group_fd -1 flags 0x8 = 21
mmap size 528384B
0x7f3e0697d0b8: mmap mask[8]:
0x7f3e0698d180: mmap mask[8]:
0x7f3e0699d248: mmap mask[8]:
0x7f3e069ad310: mmap mask[8]:
0x7f3e069bd3d8: mmap mask[8]:
0x7f3e069cd4a0: mmap mask[8]:
0x7f3e069dd568: mmap mask[8]:
0x7f3e069ed630: mmap mask[8]:
Synthesizing TSC conversion information
arch copy Documentation init kernel MAINTAINERS modules.builtin.modinfo perf.data scripts System.map vmlinux
block COPYING drivers ipc lbuild Makefile modules.order perf.data.old security tools vmlinux.o
certs CREDITS fs Kbuild lib mm Module.symvers README sound usr
config-5.2.7-100.fc29.x86_64 crypto include Kconfig LICENSES modules.builtin net samples stdio virt
[ perf record: Woken up 1 times to write data ]
Looking at the vmlinux_path (8 entries long)
Using vmlinux for symbols
[ perf record: Captured and wrote 0.013 MB perf.data (8 samples) ]

tools/perf/perf record -vv --affinity=cpu -- ls
thread mask[8]: empty
Using CPUID GenuineIntel-6-5E-3
intel_pt default config: tsc,mtc,mtc_period=3,psb_period=3,pt,branch
nr_cblocks: 0
affinity: CPU
mmap flush: 1
comp level: 0
------------------------------------------------------------
perf_event_attr:
size 120
{ sample_period, sample_freq } 4000
sample_type IP|TID|TIME|PERIOD
read_format ID
disabled 1
inherit 1
mmap 1
comm 1
freq 1
enable_on_exec 1
task 1
precise_ip 3
sample_id_all 1
exclude_guest 1
mmap2 1
comm_exec 1
ksymbol 1
bpf_event 1
------------------------------------------------------------
sys_perf_event_open: pid 23713 cpu 0 group_fd -1 flags 0x8 = 4
sys_perf_event_open: pid 23713 cpu 1 group_fd -1 flags 0x8 = 5
sys_perf_event_open: pid 23713 cpu 2 group_fd -1 flags 0x8 = 6
sys_perf_event_open: pid 23713 cpu 3 group_fd -1 flags 0x8 = 9
sys_perf_event_open: pid 23713 cpu 4 group_fd -1 flags 0x8 = 10
sys_perf_event_open: pid 23713 cpu 5 group_fd -1 flags 0x8 = 11
sys_perf_event_open: pid 23713 cpu 6 group_fd -1 flags 0x8 = 12
sys_perf_event_open: pid 23713 cpu 7 group_fd -1 flags 0x8 = 13
mmap size 528384B
0x7f3e005bc0b8: mmap mask[8]: 0
0x7f3e005cc180: mmap mask[8]: 1
0x7f3e005dc248: mmap mask[8]: 2
0x7f3e005ec310: mmap mask[8]: 3
0x7f3e005fc3d8: mmap mask[8]: 4
0x7f3e0060c4a0: mmap mask[8]: 5
0x7f3e0061c568: mmap mask[8]: 6
0x7f3e0062c630: mmap mask[8]: 7
------------------------------------------------------------
perf_event_attr:
type 1
size 120
config 0x9
watermark 1
sample_id_all 1
bpf_event 1
{ wakeup_events, wakeup_watermark } 1
------------------------------------------------------------
sys_perf_event_open: pid -1 cpu 0 group_fd -1 flags 0x8 = 14
sys_perf_event_open: pid -1 cpu 1 group_fd -1 flags 0x8 = 15
sys_perf_event_open: pid -1 cpu 2 group_fd -1 flags 0x8 = 16
sys_perf_event_open: pid -1 cpu 3 group_fd -1 flags 0x8 = 17
sys_perf_event_open: pid -1 cpu 4 group_fd -1 flags 0x8 = 18
sys_perf_event_open: pid -1 cpu 5 group_fd -1 flags 0x8 = 19
sys_perf_event_open: pid -1 cpu 6 group_fd -1 flags 0x8 = 20
sys_perf_event_open: pid -1 cpu 7 group_fd -1 flags 0x8 = 21
mmap size 528384B
0x7f3e001330b8: mmap mask[8]:
0x7f3e00143180: mmap mask[8]:
0x7f3e00153248: mmap mask[8]:
0x7f3e00163310: mmap mask[8]:
0x7f3e001733d8: mmap mask[8]:
0x7f3e001834a0: mmap mask[8]:
0x7f3e00193568: mmap mask[8]:
0x7f3e001a3630: mmap mask[8]:
Synthesizing TSC conversion information
0x9c9ff0: thread mask[8]: 0
0x9c9ff0: thread mask[8]: 1
0x9c9ff0: thread mask[8]: 2
0x9c9ff0: thread mask[8]: 3
0x9c9ff0: thread mask[8]: 4
arch copy Documentation init kernel MAINTAINERS modules.builtin.modinfo perf.data scripts System.map vmlinux
block COPYING drivers ipc lbuild Makefile modules.order perf.data.old security tools vmlinux.o
certs CREDITS fs Kbuild lib mm Module.symvers README sound usr
config-5.2.7-100.fc29.x86_64 crypto include Kconfig LICENSES modules.builtin net samples stdio virt
0x9c9ff0: thread mask[8]: 5
0x9c9ff0: thread mask[8]: 6
0x9c9ff0: thread mask[8]: 7
0x9c9ff0: thread mask[8]: 0
0x9c9ff0: thread mask[8]: 1
0x9c9ff0: thread mask[8]: 2
0x9c9ff0: thread mask[8]: 3
0x9c9ff0: thread mask[8]: 4
0x9c9ff0: thread mask[8]: 5
0x9c9ff0: thread mask[8]: 6
0x9c9ff0: thread mask[8]: 7
[ perf record: Woken up 0 times to write data ]
0x9c9ff0: thread mask[8]: 0
0x9c9ff0: thread mask[8]: 1
0x9c9ff0: thread mask[8]: 2
0x9c9ff0: thread mask[8]: 3
0x9c9ff0: thread mask[8]: 4
0x9c9ff0: thread mask[8]: 5
0x9c9ff0: thread mask[8]: 6
0x9c9ff0: thread mask[8]: 7
Looking at the vmlinux_path (8 entries long)
Using vmlinux for symbols
...
[ perf record: Captured and wrote 0.013 MB perf.data (10 samples) ]