During 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 perf top). Signed-off-by: Wang Nan <[email protected]> Cc: Hou Pengyang <[email protected]> Cc: He Kuang <[email protected]> Cc: Arnaldo Carvalho de Melo <[email protected]> --- tools/perf/util/event.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c index e20438b..4c2abdf 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 +249,8 @@ int perf_event__synthesize_mmap_events(struct perf_tool *tool, bool truncation = false; unsigned long long timeout = proc_map_timeout * 1000000ULL; int rc = 0; + const char *hugetlbfs_mnt = hugetlbfs__mountpoint(); + int hugetlbfs_mnt_len = hugetlbfs_mnt ? strlen(hugetlbfs_mnt) : 0; if (machine__is_default_guest(machine)) return 0; @@ -342,6 +345,10 @@ out: if (!strcmp(execname, "")) strcpy(execname, anonstr); + if (!strncmp(execname, hugetlbfs_mnt, hugetlbfs_mnt_len)) { + strcpy(execname, anonstr); + event->mmap2.flags |= MAP_HUGETLB; + } size = strlen(execname) + 1; memcpy(event->mmap2.filename, execname, size); -- 1.8.3.4
