Date: Wed, 3 Dec 2008 11:20:48 +0000 (UTC) From: Vadim Goncharov <vadim_nuclight@mail.ru> To: freebsd-performance@freebsd.org Subject: Re: [PATCH] pmcannotate tool Message-ID: <slrngjcqsf.2j6c.vadim_nuclight@server.filona.x88.info> References: <3bbf2fe10811230502t3cc52809i6ac91082f780b730@mail.gmail.com>
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Hi Attilio Rao! On Sun, 23 Nov 2008 14:02:22 +0100; Attilio Rao wrote about '[PATCH] pmcannotate tool': > pmcannotate is a tool that prints out sources of a tool (in C or > assembly) with inlined profiling informations retrieved by a prior > pmcstat analysis. > If compared with things like callgraph generation, it prints out > profiling on a per-instance basis and this can be useful to find, for > example, badly handled caches, too high latency instructions, etc. [...] > objdump is not the only one tool on which pmcannotare rely. Infact, in > order to have it working, pmcstat needs to be present too because we > need to retrieve, from the pmcstat raw output, informations about the > sampled PCs (in particular the name of the function they live within, > its start and ending addresses). As long as currently pmcstat doesn't > return those informations, a new option has been added to the tool > (-m) which can extract (from a raw pmcstat output) all pc sampled, > name of the functions and symbol bundaries they live within. [...] > The patch can be found here: > http://www.freebsd.org/~attilio/pmcannotate.diff/ > where pmcannotate/ dir contains the code and needs to go under > /usr/src/usr.sbin/ and the patch has diffs against pmcstat and > Makefile. It looks like this the thing I need, please see parallel thread "hwpmc granularity and 6.4 network performance", I have CPU hog ipfw_chk() which is 1200+ lines long and want to know which parts are most hogs. But that part of your patch which is for pmcstat isn't applying to 6.4 :( Could you please provide another for this ver? -- WBR, Vadim Goncharov. ICQ#166852181 mailto:vadim_nuclight@mail.ru [Moderator of RU.ANTI-ECOLOGY][FreeBSD][http://antigreen.org][LJ:/nuclight]
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