Messages in this thread Patch in this message | | | From | Wang Nan <> | Subject | [PATCH 1/3] perf tools: Recognize hugetlb mapping as anon mapping | Date | Fri, 2 Sep 2016 13:59:45 +0000 |
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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 the program uses huge pages starting, perf is able to recognize hugetlb mapping as anon mapping.
Signed-off-by: Wang Nan <wangnan0@huawei.com> Signed-off-by: Hou Pengyang <houpengyang@huawei.com> Cc: He Kuang <hekuang@huawei.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> --- tools/perf/util/map.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c index 728129a..a42010d 100644 --- a/tools/perf/util/map.c +++ b/tools/perf/util/map.c @@ -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 +25,10 @@ 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") || + return flags & MAP_HUGETLB || + !strcmp(filename, "//anon") || !strncmp(filename, "/dev/zero", sizeof("/dev/zero") - 1) || !strncmp(filename, "/anon_hugepage", sizeof("/anon_hugepage") - 1); } @@ -155,7 +157,7 @@ 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); -- 1.8.3.4
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