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Message-ID: <20070510092015.GJ4629@kernel.dk> Date: Thu, 10 May 2007 11:20:17 +0200 From: Jens Axboe <jens.axboe@...cle.com> To: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> Cc: akpm@...ux-foundation.org, linux-kernel@...r.kernel.org, hch@...radead.org Subject: Re: [patch 10/10] Port of blktrace to the Linux Kernel Markers. On Wed, May 09 2007, Mathieu Desnoyers wrote: > Here is a proof of concept patch, for demonstration purpose, of moving > blktrace to the markers. > > A few remarks : this patch has the positive effect of removing some code > from the block io tracing hot paths, minimizing the i-cache impact in a > system where the io tracing is compiled in but inactive. > > It also moves the blk tracing code from a header (and therefore from the > body of the instrumented functions) to a separate C file. > > There, as soon as one device has to be traced, every devices have to > fall into the tracing function call. This is slower than the previous > inline function which tested the condition quickly. If it becomes a > show stopper, it could be fixed by having the possibility to test a > supplementary condition, dependant of the marker context, at the marker > site, just after the enable/disable test. Did you benchmark it? -- Jens Axboe - 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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