From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wu Fengguang Subject: Re: [PATCH RFC] mm: Implement balance_dirty_pages() through waiting for flusher thread Date: Tue, 22 Jun 2010 22:41:00 +0800 Message-ID: <20100622144100.GB5477@localhost> References: <1276797878-28893-1-git-send-email-jack@suse.cz> <20100618060901.GA6590@dastard> <20100621233628.GL3828@quack.suse.cz> <20100622054409.GP7869@dastard> <20100621231416.904c50c7.akpm@linux-foundation.org> <20100622100924.GQ7869@dastard> <20100622131745.GB3338@quack.suse.cz> <20100622135234.GA11561@localhost> <20100622143124.GA15235@infradead.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Jan Kara , Dave Chinner , Andrew Morton , "linux-fsdevel@vger.kernel.org" , "linux-mm@kvack.org" , "peterz@infradead.org" To: Christoph Hellwig Return-path: Content-Disposition: inline In-Reply-To: <20100622143124.GA15235@infradead.org> Sender: owner-linux-mm@kvack.org List-Id: linux-fsdevel.vger.kernel.org On Tue, Jun 22, 2010 at 10:31:24PM +0800, Christoph Hellwig wrote: > On Tue, Jun 22, 2010 at 09:52:34PM +0800, Wu Fengguang wrote: > > 2) most writeback will be submitted by one per-bdi-flusher, so no worry > > of cache bouncing (this also means the per CPU counter error is > > normally bounded by the batch size) > > What counter are we talking about exactly? Once balanance_dirty_pages bdi_stat(bdi, BDI_WRITTEN) introduced in this patch. > stops submitting I/O the per-bdi flusher thread will in fact be > the only thing submitting writeback, unless you count direct invocations > of writeback_single_inode. Right. Thanks, Fengguang -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org