raspi/linux
1
0
Fork 1
mirror of https://github.com/raspberrypi/linux.git synced 2026-01-03 08:14:12 +00:00
Code Issues Projects Releases Wiki Activity

libperf: Add perf_evlist__alloc_pollfd() function

Browse Source 
Move perf_evlist__alloc_pollfd() from tools/perf to libperf, it will be
used in the following patches.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lore.kernel.org/lkml/20190913132355.21634-37-jolsa@kernel.org
[ Added api/fd/array.h include to the lib/evlist.c file ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa
2019-08-06 13:21:53 +02:00
committed by Arnaldo Carvalho de Melo
parent 379dd98c3d
commit 31f67fc462
4 changed files with 25 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
tools/perf/lib/evlist.c
View File

@@ -14,6 +14,7 @@
#include <unistd.h>
#include <perf/cpumap.h>
#include <perf/threadmap.h>
#include <api/fd/array.h>
void perf_evlist__init(struct perf_evlist *evlist)
{
@@ -238,3 +239,24 @@ add:
perf_evlist__id_add(evlist, evsel, cpu, thread, id);
return 0;
}
int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
{
int nr_cpus = perf_cpu_map__nr(evlist->cpus);
int nr_threads = perf_thread_map__nr(evlist->threads);
int nfds = 0;
struct perf_evsel *evsel;
perf_evlist__for_each_entry(evlist, evsel) {
if (evsel->system_wide)
nfds += nr_cpus;
else
nfds += nr_cpus * nr_threads;
}
if (fdarray__available_entries(&evlist->pollfd) < nfds &&
fdarray__grow(&evlist->pollfd, nfds) < 0)
return -ENOMEM;
return 0;
}