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perf evlist: Handle default value for 'pages' on mmap method

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Every tool that calls this and allows the user to override the value
needs this logic.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-lwscxpg57xfzahz5dmdfp9uz@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2011-11-09 09:10:47 -02:00
parent 35b9d88ecd
commit 50a682ce87
3 changed files with 11 additions and 8 deletions
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4
tools/perf/builtin-record.c
View file

@ -456,10 +456,6 @@ static int __cmd_record(int argc, const char **argv)
perf_header__set_feat(&session->header, HEADER_NUMA_TOPOLOGY);
perf_header__set_feat(&session->header, HEADER_CPUID);
/* 512 kiB: default amount of unprivileged mlocked memory */
if (mmap_pages == UINT_MAX)
mmap_pages = (512 * 1024) / page_size;
if (forks) {
err = perf_evlist__prepare_workload(evsel_list, &record_opts, argv);
if (err < 0) {

12
tools/perf/util/evlist.c
View file

@ -507,14 +507,20 @@ static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot, in
*
* Using perf_evlist__read_on_cpu does this automatically.
*/
int perf_evlist__mmap(struct perf_evlist *evlist, int pages, bool overwrite)
int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
bool overwrite)
{
unsigned int page_size = sysconf(_SC_PAGE_SIZE);
int mask = pages * page_size - 1;
struct perf_evsel *evsel;
const struct cpu_map *cpus = evlist->cpus;
const struct thread_map *threads = evlist->threads;
int prot = PROT_READ | (overwrite ? 0 : PROT_WRITE);
int prot = PROT_READ | (overwrite ? 0 : PROT_WRITE), mask;
/* 512 kiB: default amount of unprivileged mlocked memory */
if (pages == UINT_MAX)
pages = (512 * 1024) / page_size;
mask = pages * page_size - 1;
if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0)
return -ENOMEM;

3
tools/perf/util/evlist.h
View file

@ -79,7 +79,8 @@ int perf_evlist__prepare_workload(struct perf_evlist *evlist,
int perf_evlist__start_workload(struct perf_evlist *evlist);
int perf_evlist__alloc_mmap(struct perf_evlist *evlist);
int perf_evlist__mmap(struct perf_evlist *evlist, int pages, bool overwrite);
int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
bool overwrite);
void perf_evlist__munmap(struct perf_evlist *evlist);
void perf_evlist__disable(struct perf_evlist *evlist);