Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752210Ab0HVK2C (ORCPT ); Sun, 22 Aug 2010 06:28:02 -0400 Received: from fgwmail5.fujitsu.co.jp ([192.51.44.35]:44813 "EHLO fgwmail5.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752093Ab0HVK16 (ORCPT ); Sun, 22 Aug 2010 06:27:58 -0400 X-SecurityPolicyCheck-FJ: OK by FujitsuOutboundMailChecker v1.3.1 From: KOSAKI Motohiro To: KOSAKI Motohiro Subject: Re: [PATCH 4/4] writeback: Reporting dirty thresholds in /proc/vmstat Cc: kosaki.motohiro@jp.fujitsu.com, Michael Rubin , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, fengguang.wu@intel.com, jack@suse.cz, riel@redhat.com, akpm@linux-foundation.org, david@fromorbit.com, npiggin@kernel.dk, hch@lst.de, axboe@kernel.dk In-Reply-To: <20100820190603.6003.A69D9226@jp.fujitsu.com> References: <1282296689-25618-5-git-send-email-mrubin@google.com> <20100820190603.6003.A69D9226@jp.fujitsu.com> Message-Id: <20100822192710.6018.A69D9226@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Mailer: Becky! ver. 2.50.07 [ja] Date: Sun, 22 Aug 2010 19:27:54 +0900 (JST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1225 Lines: 37 > > The kernel already exposes the user desired thresholds in /proc/sys/vm > > with dirty_background_ratio and background_ratio. But the kernel may > > alter the number requested without giving the user any indication that > > is the case. > > > > Knowing the actual ratios the kernel is honoring can help app developers > > understand how their buffered IO will be sent to the disk. > > > > $ grep threshold /proc/vmstat > > nr_dirty_threshold 409111 > > nr_dirty_background_threshold 818223 > > > > Signed-off-by: Michael Rubin > > Looks good to me. > Reviewed-by: KOSAKI Motohiro sorry, this is mistake. Wu pointed out this patch is unnecessary. Wu wrote: > I realized that the dirty thresholds has already been exported here: > > $ grep Thresh /debug/bdi/8:0/stats > BdiDirtyThresh: 381000 kB > DirtyThresh: 1719076 kB > BackgroundThresh: 859536 kB > > So why not use that interface directly? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/