Em Sun, Sep 04, 2016 at 05:04:38AM +0000, Wang Nan escreveu:
> 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 starts using
> huge pages (so perf gets MMAP2 events from kernel), perf is able to
> recognize hugetlb mapping as anon mapping.
Fixing build on older distros (Centos5, Ubuntu 12.04.5, etc)
CC /tmp/build/perf/arch/x86/util/perf_regs.o
util/event.c: In function 'perf_event__synthesize_mmap_events':
util/event.c:350: error: 'MAP_HUGETLB' undeclared (first use in this function)
util/event.c:350: error: (Each undeclared identifier is reported only once
util/event.c:350: error: for each function it appears in.)
> Signed-off-by: Wang Nan <wangn...@huawei.com>
> Signed-off-by: Hou Pengyang <houpengy...@huawei.com>
> Cc: He Kuang <heku...@huawei.com>
> Cc: Arnaldo Carvalho de Melo <a...@redhat.com>
> Cc: Nilay Vaish <nilayva...@gmail.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
