From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nikita Danilov MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <16808.23030.312384.635657@gargle.gargle.HOWL> Date: Sat, 27 Nov 2004 13:41:58 +0300 Subject: Re: [PATCH]: 1/4 batch mark_page_accessed() In-Reply-To: <20041126185833.GA7740@logos.cnet> References: <16800.47044.75874.56255@gargle.gargle.HOWL> <20041126185833.GA7740@logos.cnet> Sender: owner-linux-mm@kvack.org Return-Path: To: Marcelo Tosatti Cc: Linux Kernel Mailing List , Andrew Morton , Linux MM Mailing List List-ID: Marcelo Tosatti writes: [...] > > Average Half Load -j 4 Run: Average Half Load -j 4 Run: > Elapsed Time 274.916 Elapsed Time 245.026 > User Time 833.63 User Time 832.34 > System Time 73.704 System Time 73.41 > Percent CPU 335.8 Percent CPU 373.6 > Context Switches 12984.8 Context Switches 13427.4 > Sleeps 21459.2 Sleeps 21642 What is "System Time" here? Does in include CPU consumption by, say, kswapd? If not, then one may conjecture that mark_page_accessed batching modifies ordering of pages on zone "LRU" lists in a way that measurably changes efficiency of VM scanning, and mostly affects process that scans most---kswapd. Nikita. -- 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: aart@kvack.org