| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <551018C5.4030304@gmail.com> Date: Mon, 23 Mar 2015 07:44:37 -0600 From: David Ahern <dsahern@...il.com> To: Namhyung Kim <namhyung@...nel.org>, Ingo Molnar <mingo@...nel.org> CC: Arnaldo Carvalho de Melo <acme@...nel.org>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Jiri Olsa <jolsa@...hat.com>, LKML <linux-kernel@...r.kernel.org>, Frederic Weisbecker <fweisbec@...il.com>, Stephane Eranian <eranian@...gle.com> Subject: Re: [RFC/PATCH] perf record: Save build-id of DSO in callchains On 3/23/15 2:18 AM, Namhyung Kim wrote: >> Just curious, could you try to measure the performance impact of this >> change? > > $ time perf record --call-graph dwarf -o kbuild.xxx -a -- sleep 30 > [ perf record: Woken up 34674 times to write data ] > [ perf record: Captured and wrote 9538.729 MB kbuild.xxx (1211997 samples) ] > > real 0m32.244s > user 0m1.097s > sys 0m8.997s > > $ time perf record --call-graph dwarf -o kbuild.yyy --buildid-callchain -a -- sleep 30 > [ perf record: Woken up 40902 times to write data ] > [ perf record: Captured and wrote 11208.500 MB kbuild.yyy (1433922 samples) ] > > real 2m21.695s > user 1m33.127s > sys 0m22.077s > How many CPUs and processes? David -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists