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

From: Arnaldo Carvalho de Melo
Date: Tue Dec 03 2019 - 13:36:33 EST

Em Tue, Dec 03, 2019 at 01:17:45PM +0100, Jiri Olsa escreveu:
> On Tue, Dec 03, 2019 at 02:41:29PM +0300, Alexey Budankov wrote:
> >
> > 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
>
> Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>

Applied to my local perf/core branch, going thru tests.

- Arnaldo

> thanks,
> jirka
>
> > 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) ]
> >

--

- Arnaldo