perf record: Mark MAP_HUGETLB when synthesizing mmap events (d7e404af) · Commits · 戴 / test

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 −0

Original line number	Diff line number	Diff line
		#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);

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