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[PATCH 08/12] perf record: Mark MAP_HUGETLB when synthesizing mmap events

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From: Wang Nan <wangnan0@huawei.com>

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>
---
 tools/perf/util/event.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 9ad7d32dba2b..6c3017139c67 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -1,5 +1,6 @@
 #include <linux/types.h>
 #include <sys/mman.h>
+#include <api/fs/fs.h>
 #include "event.h"
 #include "debug.h"
 #include "hist.h"
@@ -248,6 +249,10 @@ int perf_event__synthesize_mmap_events(struct perf_tool *tool,
 	bool truncation = false;
 	unsigned long long timeout = proc_map_timeout * 1000000ULL;
 	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))
 		return 0;
@@ -342,6 +347,12 @@ out:
 
 		if (!strcmp(execname, ""))
 			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;
 		memcpy(event->mmap2.filename, execname, size);
-- 
2.7.4

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[GIT PULL 00/12] perf/core improvements and fixes Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-09-08 22:50 +0200
  [PATCH 07/12] tools lib api fs: Add hugetlbfs filesystem detector Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-09-08 22:50 +0200
  [PATCH 02/12] perf top: Remove old kernel-only symbol filter Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-09-08 22:50 +0200
  [PATCH 06/12] perf tools: Recognize hugetlb mapping as anon mapping Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-09-08 22:50 +0200
  [PATCH 11/12] perf pmu: Support alternative sysfs cpumask Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-09-08 22:50 +0200
  [PATCH 12/12] perf powerpc: Fix build-test failure Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-09-08 22:50 +0200
  [PATCH 08/12] perf record: Mark MAP_HUGETLB when synthesizing mmap events Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-09-08 22:50 +0200
  [PATCH 04/12] perf test vmlinux: Remove dead symbol_filter_t code Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-09-08 22:50 +0200
  [PATCH 10/12] perf evlist: Only open events on CPUs an evsel permits Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-09-08 22:50 +0200
  [PATCH 03/12] perf machine: Remove machine->symbol_filter and friends Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-09-08 22:50 +0200
  Re: [GIT PULL 00/12] perf/core improvements and fixes Ingo Molnar <mingo@kernel.org> - 2016-09-09 07:50 +0200

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