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Date: Tue, 2 Aug 2022 11:25:02 -0700 From: Brian Robbins <brianrob@...ux.microsoft.com> To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, Mark Rutland <mark.rutland@....com>, Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org> Cc: linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org, brianrob@...ux.microsoft.com Subject: [PATCH] perf inject jit: Ignore memfd mmap events if jitdump present Some processes store jitted code in memfd mappings to avoid having rwx mappings. These processes map the code with a writeable mapping and a read-execute mapping. They write the code using the writeable mapping and then unmap the writeable mapping. All subsequent execution is through the read-execute mapping. perf inject --jit ignores //anon* mappings for each process where a jitdump is present because it expects to inject mmap events for each jitted code range, and said jitted code ranges will overlap with the //anon* mappings. Ignore /memfd: mappings so that jitted code contained in /memfd: mappings is treated the same way as jitted code contained in //anon* mappings. Signed-off-by: Brian Robbins <brianrob@...ux.microsoft.com> --- tools/perf/util/jitdump.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/tools/perf/util/jitdump.c b/tools/perf/util/jitdump.c index a23255773c60..335a3c61940b 100644 --- a/tools/perf/util/jitdump.c +++ b/tools/perf/util/jitdump.c @@ -845,8 +845,12 @@ jit_process(struct perf_session *session, if (jit_detect(filename, pid, nsi)) { nsinfo__put(nsi); - // Strip //anon* mmaps if we processed a jitdump for this pid - if (jit_has_pid(machine, pid) && (strncmp(filename, "//anon", 6) == 0)) + /* + * Strip //anon* and /memfd:* mmaps if we processed a jitdump for this pid + */ + if (jit_has_pid(machine, pid) && + ((strncmp(filename, "//anon", 6) == 0) || + (strncmp(filename, "/memfd:", 7) == 0)) return 1; return 0; -- 2.25.1
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