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Message-ID: <4E5D36C7.5020706@kernel.dk> Date: Tue, 30 Aug 2011 13:15:19 -0600 From: Jens Axboe <axboe@...nel.dk> To: Namhyung Kim <namhyung@...il.com> CC: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 2/6] block: introduce __bio_endio() On 2011-08-28 21:47, Namhyung Kim wrote: > Currently, bio_endio() lacks its completion tracepoint in it, > so that the bio-based devices - except DM which inserted the > tracepoint explicitly - cannot send us such an event when using > blktrace. Adding the tracepoint in the function will fix this. > > However, bio_endio() is also used for other ways like some > nested bio-handling path and request-based devices. Simply > adding will result in duplicated event for those cases. Thus > add new __bio_endio() function to do things as before but no > tracepoint. Similarly, __bio_io_error() helper was added too. Not crazy about this solution, it seems a little fragile. And it's hard to know what the difference between bio_endio() and __bio_endio() is without looking at the code. I think it would be cleaner to mark a bio as going inflight, so that we can check this flag on completion. If it's never been in flight, don't trigger a completion event trace for 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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