From 67dec926931448d688efb5fe34f7b5a22470fc0a Mon Sep 17 00:00:00 2001 From: Yonatan Goldschmidt Date: Thu, 5 Nov 2020 03:56:04 +0200 Subject: perf inject jit: Add namespaces support This patch fixes "perf inject --jit" to properly operate on namespaced/containerized processes: * jitdump files are generated by the process, thus they should be looked up in its mount NS. * DSOs of injected MMAP events will later be looked up in the process mount NS, so write them into its NS. * PIDs & TIDs from jitdump events need to be translated to the PID as seen by "perf record" before written into MMAP events. For a process in a different PID NS, the TID & PID given in the jitdump event are actually ignored; I use the TID & PID of the thread which mmap()ed the jitdump file. This is simplified and won't do for forks of the initial process, if they continue using the same jitdump file. Future patches might improve it. This was tested by recording a NodeJS process running with "--perf-prof", inside a Docker container, and by recording another NodeJS process running in the same namespaces as perf itself, to make sure it's not broken for non-containerized processes. Signed-off-by: Yonatan Goldschmidt Acked-by: Jiri Olsa Acked-by: Namhyung Kim Cc: Alexander Shishkin Cc: Ingo Molnar Cc: Mark Rutland Cc: Peter Zijlstra Cc: Stephane Eranian Link: https://lore.kernel.org/r/20201105015604.1726943-1-yonatan.goldschmidt@granulate.io Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-inject.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'tools/perf/builtin-inject.c') diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c index 43937f4b399a..6fe44d97fde5 100644 --- a/tools/perf/builtin-inject.c +++ b/tools/perf/builtin-inject.c @@ -313,7 +313,7 @@ static int perf_event__jit_repipe_mmap(struct perf_tool *tool, * if jit marker, then inject jit mmaps and generate ELF images */ ret = jit_process(inject->session, &inject->output, machine, - event->mmap.filename, event->mmap.pid, &n); + event->mmap.filename, event->mmap.pid, event->mmap.tid, &n); if (ret < 0) return ret; if (ret) { @@ -413,7 +413,7 @@ static int perf_event__jit_repipe_mmap2(struct perf_tool *tool, * if jit marker, then inject jit mmaps and generate ELF images */ ret = jit_process(inject->session, &inject->output, machine, - event->mmap2.filename, event->mmap2.pid, &n); + event->mmap2.filename, event->mmap2.pid, event->mmap2.tid, &n); if (ret < 0) return ret; if (ret) { -- cgit v1.2.3