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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 11:46:09 -0300 |
| commit | 8384a2600c7ddfc875f64e160d8b423aca4e203a (patch) | |
| tree | ed90ff3719bfd1e7bbcc6fa4a7716745cc596016 /tools/perf/util/mmap.h | |
| parent | perf mmap: Declare type for cpu mask of arbitrary length (diff) | |
| download | linux-dev-8384a2600c7ddfc875f64e160d8b423aca4e203a.tar.xz linux-dev-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 <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 '')
| -rw-r--r-- | tools/perf/util/mmap.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/util/mmap.h b/tools/perf/util/mmap.h index ef51667fabcb..9d5f589f02ae 100644 --- a/tools/perf/util/mmap.h +++ b/tools/perf/util/mmap.h @@ -40,7 +40,7 @@ struct mmap { int nr_cblocks; } aio; #endif - cpu_set_t affinity_mask; + struct mmap_cpu_mask affinity_mask; void *data; int comp_level; }; |