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libperf: Add 'struct perf_mmap_param'

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Add libperf's version of mmap params 'struct perf_mmap_param' object
with the basics: 'prot' and 'mask'.  Encapsulate it in the current
'struct mmap_params' object.

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 <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20191007125344.14268-3-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2019-10-07 14:53:10 +02:00 committed by Arnaldo Carvalho de Melo
parent 353120b48d
commit e440979faf
4 changed files with 18 additions and 8 deletions
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5
tools/perf/lib/include/internal/mmap.h
View File

@ -29,6 +29,11 @@ struct perf_mmap {
char event_copy[PERF_SAMPLE_MAX_SIZE] __aligned(8);
};
struct perf_mmap_param {
int prot;
int mask;
};
void perf_mmap__init(struct perf_mmap *map, bool overwrite);
#endif /* __LIBPERF_INTERNAL_MMAP_H */

14
tools/perf/util/evlist.c
View File

@ -667,7 +667,7 @@ static int evlist__mmap_per_evsel(struct evlist *evlist, int idx,
int fd;
int cpu;
mp->prot = PROT_READ | PROT_WRITE;
mp->core.prot = PROT_READ | PROT_WRITE;
if (evsel->core.attr.write_backward) {
output = _output_overwrite;
maps = evlist->overwrite_mmap;
@ -680,7 +680,7 @@ static int evlist__mmap_per_evsel(struct evlist *evlist, int idx,
if (evlist->bkw_mmap_state == BKW_MMAP_NOTREADY)
perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING);
}
mp->prot &= ~PROT_WRITE;
mp->core.prot &= ~PROT_WRITE;
}
if (evsel->core.system_wide && thread)
@ -921,8 +921,12 @@ int evlist__mmap_ex(struct evlist *evlist, unsigned int pages,
* Its value is decided by evsel's write_backward.
* So &mp should not be passed through const pointer.
*/
struct mmap_params mp = { .nr_cblocks = nr_cblocks, .affinity = affinity, .flush = flush,
.comp_level = comp_level };
struct mmap_params mp = {
.nr_cblocks = nr_cblocks,
.affinity = affinity,
.flush = flush,
.comp_level = comp_level
};
if (!evlist->mmap)
evlist->mmap = evlist__alloc_mmap(evlist, false);
@ -934,7 +938,7 @@ int evlist__mmap_ex(struct evlist *evlist, unsigned int pages,
evlist->core.mmap_len = evlist__mmap_size(pages);
pr_debug("mmap size %zuB\n", evlist->core.mmap_len);
mp.mask = evlist->core.mmap_len - page_size - 1;
mp.core.mask = evlist->core.mmap_len - page_size - 1;
auxtrace_mmap_params__init(&mp.auxtrace_mp, evlist->core.mmap_len,
auxtrace_pages, auxtrace_overwrite);

4
tools/perf/util/mmap.c
View File

@ -370,8 +370,8 @@ int perf_mmap__mmap(struct mmap *map, struct mmap_params *mp, int fd, int cpu)
*/
refcount_set(&map->core.refcnt, 2);
map->core.prev = 0;
map->core.mask = mp->mask;
map->core.base = mmap(NULL, perf_mmap__mmap_len(map), mp->prot,
map->core.mask = mp->core.mask;
map->core.base = mmap(NULL, perf_mmap__mmap_len(map), mp->core.prot,
MAP_SHARED, fd, 0);
if (map->core.base == MAP_FAILED) {
pr_debug2("failed to mmap perf event ring buffer, error %d\n",

3
tools/perf/util/mmap.h
View File

@ -37,7 +37,8 @@ struct mmap {
};
struct mmap_params {
int prot, mask, nr_cblocks, affinity, flush, comp_level;
struct perf_mmap_param core;
int nr_cblocks, affinity, flush, comp_level;
struct auxtrace_mmap_params auxtrace_mp;
};