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| author | Alexey Budankov <[email protected]> | 2019-12-03 11:45:27 +0000 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <[email protected]> | 2020-01-06 14:46:09 +0000 |
| commit | 8384a2600c7ddfc875f64e160d8b423aca4e203a (patch) | |
| tree | ed90ff3719bfd1e7bbcc6fa4a7716745cc596016 /tools/lib/perf/xyarray.c | |
| parent | perf mmap: Declare type for cpu mask of arbitrary length (diff) | |
| download | kernel-8384a2600c7ddfc875f64e160d8b423aca4e203a.tar.gz kernel-8384a2600c7ddfc875f64e160d8b423aca4e203a.zip | |
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 <[email protected]>
Signed-off-by: Alexey Budankov <[email protected]>
Acked-by: Jiri Olsa <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lore.kernel.org/lkml/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
Diffstat (limited to 'tools/lib/perf/xyarray.c')
0 files changed, 0 insertions, 0 deletions