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perf tools: Recognize hugetlb mapping as anon mapping 

Hugetlbfs mapping should be recognized as anon mapping so user has a
chance to create /tmp/perf-<pid>.map file for symbol resolving. This
patch utilizes MAP_HUGETLB to identify hugetlb mapping.

After this patch, if perf is started before a program starts using huge
pages (so perf gets MMAP2 events from kernel), perf is able to recognize
hugetlb mapping as anon mapping.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Nilay Vaish <nilayvaish@gmail.com>
Cc: Zefan Li <lizefan@huawei.com>
Link: http://lkml.kernel.org/r/1473137909-142064-2-git-send-email-wangnan0@huawei.com
Signed-off-by: Hou Pengyang <houpengyang@huawei.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Wang Nan 2016-09-06 04:58:27 +00:00 committed by Arnaldo Carvalho de Melo
parent be39db9f29
commit 0ac3348e50
1 changed files with 10 additions and 3 deletions
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13
tools/perf/util/map.c
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@ -6,6 +6,7 @@
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/mman.h>
#include "map.h"
#include "thread.h"
#include "strlist.h"
@ -24,9 +25,15 @@ const char *map_type__name[MAP__NR_TYPES] = {
[MAP__VARIABLE] = "Variables",
};
static inline int is_anon_memory(const char *filename)
static inline int is_anon_memory(const char *filename, u32 flags)
{
return !strcmp(filename, "//anon") ||
u32 anon_flags = 0;
#ifdef MAP_HUGETLB
anon_flags |= MAP_HUGETLB;
#endif
return flags & anon_flags ||
!strcmp(filename, "//anon") ||
!strncmp(filename, "/dev/zero", sizeof("/dev/zero") - 1) ||
!strncmp(filename, "/anon_hugepage", sizeof("/anon_hugepage") - 1);
}
@ -155,7 +162,7 @@ struct map *map__new(struct machine *machine, u64 start, u64 len,
int anon, no_dso, vdso, android;
android = is_android_lib(filename);
anon = is_anon_memory(filename);
anon = is_anon_memory(filename, flags);
vdso = is_vdso_map(filename);
no_dso = is_no_dso_memory(filename);