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| author | Alexey Budankov <alexey.budankov@linux.intel.com> | 2019-12-03 14:45:27 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2020-01-06 17:46:09 +0300 |
| commit | 8384a2600c7ddfc875f64e160d8b423aca4e203a (patch) | |
| tree | ed90ff3719bfd1e7bbcc6fa4a7716745cc596016 /tools/perf/Documentation/perf-sched.txt | |
| parent | 9c080c0279a80057cad3dfc05d09fb283ddf72f4 (diff) | |
| download | linux-8384a2600c7ddfc875f64e160d8b423aca4e203a.tar.xz | |
perf record: Adapt affinity to machines with #CPUs > 1K
Use struct mmap_cpu_mask type for the tool's thread and mmap data
buffers to overcome current 1024 CPUs mask size limitation of cpu_set_t
type.
Currently glibc's cpu_set_t type has an internal mask size limit of 1024
CPUs.
Moving to the 'struct mmap_cpu_mask' type allows overcoming that limit.
The tools bitmap API is used to manipulate objects of 'struct mmap_cpu_mask'
type.
Committer notes:
To print the 'nbits' struct member we must use %zd, since it is a
size_t, this fixes the build in some toolchains/arches.
Reported-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/96d7e2ff-ce8b-c1e0-d52c-aa59ea96f0ea@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/Documentation/perf-sched.txt')
0 files changed, 0 insertions, 0 deletions