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Message-Id: <1218677690.6166.51.camel@dhcp32.mvista.com> Date: Wed, 13 Aug 2008 18:34:49 -0700 From: Daniel Walker <dwalker@...sta.com> To: Dave Chinner <david@...morbit.com> Cc: xfs@....sgi.com, linux-kernel@...r.kernel.org, matthew@....cx Subject: Re: [PATCH 4/6] Replace inode flush semaphore with a completion On Thu, 2008-08-14 at 10:19 +1000, Dave Chinner wrote: > *However*, given that we already have this exact state in the > completion itself, I see little reason for adding the additional > locking overhead and the complexity of race conditions of keeping > this state coherent with the completion. Modifying the completion > API slightly to export this state is the simplest, easiest solution > to the problem.... > I'm not suggesting anything concrete at this point, I'm just thinking about it. If you assume that most of the time your doing async flushing, you wouldn't often need to do blocking on the completion .. Another way of doing it would be drop the completion most of the time, and just use the flag. Then in the rare case that a function needs to block make a stack local completion, pass it as a pointer inside the xfs_inode_t, if it's non-null when the write is finished you would complete(). Daniel -- 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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