From: Sukadev Bhattiprolu Date: Wed, 22 Oct 2014 00:09:58 +0000 (-0700) Subject: perf tools powerpc: Cache the DWARF debug info X-Git-Tag: omap-for-v3.19/fixes-rc1~167^2~16^2~24 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7d073b335edc8d97af730c2e3b83ed6642bd3c27;p=pandora-kernel.git perf tools powerpc: Cache the DWARF debug info Cache the DWARF debug info for DSO so we don't have to rebuild it for each address in the DSO. Note that dso__new() uses calloc() so don't need to set dso->dwfl to NULL. $ /tmp/perf.orig --version perf version 3.18.rc1.gc2661b8 $ /tmp/perf.new --version perf version 3.18.rc1.g402d62 $ perf stat -e cycles,instructions /tmp/perf.orig report -g > orig Performance counter stats for '/tmp/perf.orig report -g': 6,428,177,183 cycles # 0.000 GHz 4,176,288,391 instructions # 0.65 insns per cycle 1.840666132 seconds time elapsed $ perf stat -e cycles,instructions /tmp/perf.new report -g > new Performance counter stats for '/tmp/perf.new report -g': 305,773,142 cycles # 0.000 GHz 276,048,272 instructions # 0.90 insns per cycle 0.087693543 seconds time elapsed $ diff orig new $ Changelog[v2]: [Arnaldo Carvalho] Cache in existing global objects rather than create new static/globals in functions. Reported-by: Anton Blanchard Signed-off-by: Sukadev Bhattiprolu Cc: Anton Blanchard Cc: Jiri Olsa Link: http://lkml.kernel.org/r/20141022000958.GB2228@us.ibm.com Signed-off-by: Arnaldo Carvalho de Melo --- Reading git-diff-tree failed