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>

This commit is contained in:

Alexey Budankov

2019-12-03 14:45:27 +03:00

committed by

Arnaldo Carvalho de Melo

parent 9c080c0279

commit 8384a2600c

3 changed files with 45 additions and 13 deletions

									
										tools/perf/util/mmap.h
									
		+1
		-1
	
												View File
												
				@@ -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;

				};