linux-kernel - Re: [PATCH 2/4] perf inject jit: Fix JIT_CODE

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Date:   Mon, 30 Sep 2019 07:47:28 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Steve MacLean <Steve.MacLean@...rosoft.com>
Cc:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Eric Saint-Etienne <eric.saint.etienne@...cle.com>,
        John Keeping <john@...anate.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Song Liu <songliubraving@...com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Leo Yan <leo.yan@...aro.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Brian Robbins <brianrob@...rosoft.com>,
        Tom McDonald <Thomas.McDonald@...rosoft.com>,
        John Salem <josalem@...rosoft.com>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 2/4] perf inject jit: Fix JIT_CODE_MOVE filename

Em Sat, Sep 28, 2019 at 01:41:18AM +0000, Steve MacLean escreveu:
> During perf inject --jit, JIT_CODE_MOVE records were injecting MMAP records
> with an incorrect filename. Specifically it was missing the ".so" suffix.
> 
> Further the JIT_CODE_LOAD record were silently truncating the
> jr->load.code_index field to 32 bits before generating the filename.
> 
> Make both records emit the same filename based on the full 64 bit
> code_index field.

Thanks, applied and added:

[acme@...co perf]$ git tag --contains 9b07e27f88b9 | grep ^v[[:digit:]] | sort --version-sort | head -5
v4.6
v4.6-rc1
v4.6-rc2
v4.6-rc3
v4.6-rc4
[acme@...co perf]$

Cc: stable@...r.kernel.org # v4.6+
Fixes: 9b07e27f88b9 ("perf inject: Add jitdump mmap injection support")

So that the stable folks get this backported.

- Arnaldo
 
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
> Cc: Jiri Olsa <jolsa@...hat.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Stephane Eranian <eranian@...gle.com>
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Steve MacLean <Steve.MacLean@...rosoft.com>
> ---
>  tools/perf/util/jitdump.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/perf/util/jitdump.c b/tools/perf/util/jitdump.c
> index 1bdf4c6..e3ccb0c 100644
> --- a/tools/perf/util/jitdump.c
> +++ b/tools/perf/util/jitdump.c
> @@ -395,7 +395,7 @@ static int jit_repipe_code_load(struct jit_buf_desc *jd, union jr_entry *jr)
>  	size_t size;
>  	u16 idr_size;
>  	const char *sym;
> -	uint32_t count;
> +	uint64_t count;
>  	int ret, csize, usize;
>  	pid_t pid, tid;
>  	struct {
> @@ -418,7 +418,7 @@ static int jit_repipe_code_load(struct jit_buf_desc *jd, union jr_entry *jr)
>  		return -1;
>  
>  	filename = event->mmap2.filename;
> -	size = snprintf(filename, PATH_MAX, "%s/jitted-%d-%u.so",
> +	size = snprintf(filename, PATH_MAX, "%s/jitted-%d-%" PRIu64 ".so",
>  			jd->dir,
>  			pid,
>  			count);
> @@ -529,7 +529,7 @@ static int jit_repipe_code_move(struct jit_buf_desc *jd, union jr_entry *jr)
>  		return -1;
>  
>  	filename = event->mmap2.filename;
> -	size = snprintf(filename, PATH_MAX, "%s/jitted-%d-%"PRIu64,
> +	size = snprintf(filename, PATH_MAX, "%s/jitted-%d-%" PRIu64 ".so",
>  	         jd->dir,
>  	         pid,
>  		 jr->move.code_index);
> -- 
> 2.7.4

-- 

- Arnaldo