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Date: Tue, 10 Sep 2013 11:52:17 +0200 From: Jiri Olsa <jolsa@...hat.com> To: Namhyung Kim <namhyung@...nel.org> Cc: Arnaldo Carvalho de Melo <acme@...stprotocols.net>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...nel.org>, Namhyung Kim <namhyung.kim@....com>, LKML <linux-kernel@...r.kernel.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Frederic Weisbecker <fweisbec@...il.com> Subject: Re: [PATCH 1/3] perf callchain: Convert children list to rbtree On Tue, Sep 10, 2013 at 05:24:16PM +0900, Namhyung Kim wrote: > From: Namhyung Kim <namhyung.kim@....com> > > Current collapse stage has a scalability problem which can be > reproduced easily with parallel kernel build. This is because it > needs to traverse every children of callchain linearly during the > collapse/merge stage. Convert it to rbtree reduced the overhead > significantly. > > On my 400MB perf.data file which recorded with make -j32 kernel build: nice!!! tried on 2.6 GB data file from kernel make -j64 and got report speed up from 'never' to 2m52.756s ;-) jirka -- 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/
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