linux-kernel - Re: [PATCH V2 2/3] tools/perf: Use is_perf_pid_map_name helper function to check dso's of pattern /tmp/perf-%d.map

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Message-Id: <B5A7F119-DC65-4439-B856-F7D1DE9E3F97@linux.vnet.ibm.com>
Date: Tue, 18 Jun 2024 14:56:32 +0530
From: Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
To: Adrian Hunter <adrian.hunter@...el.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>, Jiri Olsa <jolsa@...nel.org>,
        Ian Rogers <irogers@...gle.com>, Namhyung Kim <namhyung@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>, akanksha@...ux.ibm.com,
        Madhavan Srinivasan <maddy@...ux.ibm.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Disha Goel <disgoel@...ux.vnet.ibm.com>
Subject: Re: [PATCH V2 2/3] tools/perf: Use is_perf_pid_map_name helper
 function to check dso's of pattern /tmp/perf-%d.map



> On 18 Jun 2024, at 12:41 PM, Adrian Hunter <adrian.hunter@...el.com> wrote:
> 
> On 17/06/24 16:03, Athira Rajeev wrote:
>> commit 80d496be89ed ("perf report: Add support for profiling JIT
>> generated code") added support for profiling JIT generated code.
>> This patch handles dso's of form "/tmp/perf-$PID.map".
>> 
>> Some of the references doesn't check exactly for same pattern.
>> some uses "if (!strncmp(dso_name, "/tmp/perf-", 10))". Fix
>> this by using helper function is_perf_pid_map_name which looks
>> for proper pattern of form: "/tmp/perf-$PID.map" for these checks.
>> 
>> Signed-off-by: Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
>> ---
>> tools/perf/util/dsos.c    | 2 +-
>> tools/perf/util/srcline.c | 2 +-
>> 2 files changed, 2 insertions(+), 2 deletions(-)
>> 
>> diff --git a/tools/perf/util/dsos.c b/tools/perf/util/dsos.c
>> index ab3d0c01dd63..23cd02aa701d 100644
>> --- a/tools/perf/util/dsos.c
>> +++ b/tools/perf/util/dsos.c
>> @@ -275,7 +275,7 @@ static void dso__set_basename(struct dso *dso)
>> char *base, *lname;
>> int tid;
>> 
>> - if (sscanf(dso__long_name(dso), "/tmp/perf-%d.map", &tid) == 1) {
>> + if (is_perf_pid_map_name(dso__long_name(dso))) {
> 
> Perhaps add another helper for this case:
> 
> bool perf_pid_map_tid(const char *dso_name, int *tid)
> {
> return sscanf(dso_name, "/tmp/perf-%d.map", &tid) == 1;
> }
> 
> bool is_perf_pid_map_name(const char *dso_name)
> {
> int tid;
> 
> return perf_pid_map_tid(dso_name, &tid);
> }
> 
> And then:
> 
> if (perf_pid_map_tid(dso__long_name(dso), &tid)) {
> 
> 

Hi Adrian

Thanks for suggestions. I will be posting V3 soon.

Athira
> 
>> if (asprintf(&base, "[JIT] tid %d", tid) < 0)
>> return;
>> } else {
>> diff --git a/tools/perf/util/srcline.c b/tools/perf/util/srcline.c
>> index 9d670d8c1c08..51eb78993fe2 100644
>> --- a/tools/perf/util/srcline.c
>> +++ b/tools/perf/util/srcline.c
>> @@ -39,7 +39,7 @@ static const char *srcline_dso_name(struct dso *dso)
>> if (dso_name[0] == '[')
>> return NULL;
>> 
>> - if (!strncmp(dso_name, "/tmp/perf-", 10))
>> + if (is_perf_pid_map_name(dso_name))
>> return NULL;
>> 
>> return dso_name;
>