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From: Florian Fainelli <f.fainelli@gmail.com>
To: Jiri Olsa <jolsa@redhat.com>
Cc: linux-kernel@vger.kernel.org,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Namhyung Kim <namhyung@kernel.org>,
	Kim Phillips <kim.phillips@arm.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ravi Bangoria <ravi.bangoria@linux.ibm.com>,
	Thomas Richter <tmricht@linux.ibm.com>,
	rmk+kernel@armlinux.org.uk, l.stach@pengutronix.de
Subject: Re: [PATCH v2 1/2] perf tools: Make find_vdso_map() more modular
Date: Mon, 10 Dec 2018 12:16:39 -0800	[thread overview]
Message-ID: <710f2a6d-8e8d-11bd-13a0-04cba9ebeba5@gmail.com> (raw)
In-Reply-To: <20181127093105.GC8908@krava>

On 11/27/18 1:31 AM, Jiri Olsa wrote:
> On Thu, Oct 25, 2018 at 10:55:07AM -0700, Florian Fainelli wrote:
>> In preparation for checking that the vectors page on the ARM
>> architecture, refactor the find_vdso_map() function to accept finding an
>> arbitrary string and create a dedicated helper function for that under
>> util/find-map.c and update find_vdso_map() to use it.
>>
>> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
>> ---
>>  tools/perf/util/find-map.c      | 31 +++++++++++++++++++++++++++++++
>>  tools/perf/util/find-vdso-map.c | 30 +++---------------------------
>>  2 files changed, 34 insertions(+), 27 deletions(-)
>>  create mode 100644 tools/perf/util/find-map.c
>>
>> diff --git a/tools/perf/util/find-map.c b/tools/perf/util/find-map.c
>> new file mode 100644
>> index 000000000000..19a3431a7b2a
>> --- /dev/null
>> +++ b/tools/perf/util/find-map.c
>> @@ -0,0 +1,31 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +static int find_map(void **start, void **end, const char *name)
>> +{
>> +	FILE *maps;
>> +	char line[128];
>> +	int found = 0;
>> +
>> +	maps = fopen("/proc/self/maps", "r");
>> +	if (!maps) {
>> +		fprintf(stderr, "vdso: cannot open maps\n");
>> +		return -1;
>> +	}
>> +
>> +	while (!found && fgets(line, sizeof(line), maps)) {
>> +		int m = -1;
>> +
>> +		/* We care only about private r-x mappings. */
>> +		if (2 != sscanf(line, "%p-%p r-xp %*x %*x:%*x %*u %n",
>> +				start, end, &m))
>> +			continue;
>> +		if (m < 0)
>> +			continue;
>> +
>> +		if (!strncmp(&line[m], name, strlen(name)))
>> +			found = 1;
>> +	}
>> +
>> +	fclose(maps);
>> +	return !found;
>> +}
> 
> please keep just one object for both.. looks to me like
> it coud go to util.c.. or just find-map.c if there's
> a reason to have this separated

The reason for keeping both implementations separate is because
VDSO__MAP_NAME may not be defined/applicable for all architectures, so
instead of having them have to define VDSO__MAP_NAME just to get that
file to build, they would only include find-map.c to get access to
find_map() and then search for specific tokens.

Would you prefer if find_map() was moved to tools/perf/util/util.c?
-- 
Florian

  reply	other threads:[~2018-12-10 20:16 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-25 17:55 [PATCH v2 0/2] perf tests: Check for ARM [vectors] page Florian Fainelli
2018-10-25 17:55 ` [PATCH v2 1/2] perf tools: Make find_vdso_map() more modular Florian Fainelli
2018-11-27  9:31   ` Jiri Olsa
2018-12-10 20:16     ` Florian Fainelli [this message]
2018-11-27  9:33   ` Jiri Olsa
2018-10-25 17:55 ` [PATCH v2 2/2] perf tests: Add a test for the ARM 32-bit [vectors] page Florian Fainelli
2018-11-13 22:44 ` [PATCH v2 0/2] perf tests: Check for ARM " Florian Fainelli
2018-11-27  0:27   ` Florian Fainelli
2018-11-27  9:32 ` Jiri Olsa

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