perf tools: Recognize hugetlb mapping as anon mapping (0ac3348e) · Commits · 戴 / test

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>

tools/perf/util/map.c

+10 −3

Original line number	Diff line number	Diff line
		@@ -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);

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