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perf record: Mark MAP_HUGETLB when synthesizing mmap events

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When synthesizing mmap events, add MAP_HUGETLB map flag if the source of
mapping is file in hugetlbfs.

After this patch, perf can identify hugetlb mapping even if perf is
started after the mapping of huge pages (like with 'perf top').

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Reviewed-by: Nilay Vaish <nilayvaish@gmail.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Hou Pengyang <houpengyang@huawei.com>
Cc: Zefan Li <lizefan@huawei.com>
Link: http://lkml.kernel.org/r/1473137909-142064-4-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Wang Nan 2016-09-06 04:58:29 +00:00 committed by Arnaldo Carvalho de Melo
parent 5e7be3e1f9
commit d7e404af11
1 changed files with 11 additions and 0 deletions
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11
tools/perf/util/event.c
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@ -1,5 +1,6 @@
#include <linux/types.h> #include <linux/types.h>
#include <sys/mman.h> #include <sys/mman.h>
#include <api/fs/fs.h>
#include "event.h" #include "event.h"
#include "debug.h" #include "debug.h"
#include "hist.h" #include "hist.h"
@ -248,6 +249,10 @@ int perf_event__synthesize_mmap_events(struct perf_tool *tool,
bool truncation = false; bool truncation = false;
unsigned long long timeout = proc_map_timeout * 1000000ULL; unsigned long long timeout = proc_map_timeout * 1000000ULL;
int rc = 0; int rc = 0;
#ifdef MAP_HUGETLB
const char *hugetlbfs_mnt = hugetlbfs__mountpoint();
int hugetlbfs_mnt_len = hugetlbfs_mnt ? strlen(hugetlbfs_mnt) : 0;
#endif
if (machine__is_default_guest(machine)) if (machine__is_default_guest(machine))
return 0; return 0;
@ -342,6 +347,12 @@ out:
if (!strcmp(execname, "")) if (!strcmp(execname, ""))
strcpy(execname, anonstr); strcpy(execname, anonstr);
#ifdef MAP_HUGETLB
if (!strncmp(execname, hugetlbfs_mnt, hugetlbfs_mnt_len)) {
strcpy(execname, anonstr);
event->mmap2.flags |= MAP_HUGETLB;
}
#endif
size = strlen(execname) + 1; size = strlen(execname) + 1;
memcpy(event->mmap2.filename, execname, size); memcpy(event->mmap2.filename, execname, size);