From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f49.google.com (mail-wm0-f49.google.com [74.125.82.49]) by kanga.kvack.org (Postfix) with ESMTP id B8AD46B0009 for ; Tue, 2 Feb 2016 08:59:53 -0500 (EST) Received: by mail-wm0-f49.google.com with SMTP id 128so119478683wmz.1 for ; Tue, 02 Feb 2016 05:59:53 -0800 (PST) Received: from mail-wm0-x229.google.com (mail-wm0-x229.google.com. [2a00:1450:400c:c09::229]) by mx.google.com with ESMTPS id t4si4876327wme.83.2016.02.02.05.59.52 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 02 Feb 2016 05:59:52 -0800 (PST) Received: by mail-wm0-x229.google.com with SMTP id l66so118262931wml.0 for ; Tue, 02 Feb 2016 05:59:52 -0800 (PST) Date: Tue, 2 Feb 2016 15:59:50 +0200 From: "Kirill A. Shutemov" Subject: Re: [REGRESSION] [BISECTED] kswapd high CPU usage Message-ID: <20160202135950.GA5026@node.shutemov.name> References: <20160121161656.GA16564@node.shutemov.name> <20160125103853.GD11095@node.shutemov.name> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org List-ID: To: Hugh Greenberg , Andrea Arcangeli , Mel Gorman , Vlastimil Babka , Rik van Riel , Minchan Kim , Nitin Gupta , Sergey Senozhatsky Cc: linux-mm@kvack.org, Andrew Morton On Mon, Jan 25, 2016 at 04:46:58PM +0000, Hugh Greenberg wrote: > Kirill A. Shutemov shutemov.name> writes: > > > > > On Sat, Jan 23, 2016 at 03:57:21PM +0000, Hugh Greenberg wrote: > > > Kirill A. Shutemov shutemov.name> writes: > > > > > > > > Could you try to insert > "late_initcall(set_recommended_min_free_kbytes);" > > > > back and check if makes any difference. > > > > > > > > > > We tested adding late_initcall(set_recommended_min_free_kbytes); > > > back in 4.1.14 and it made a huge difference. We aren't sure if the > > > issue is 100% fixed, but it could be. We will keep testing it. > > > > It would be nice to have values of min_free_kbytes before and after > > set_recommended_min_free_kbytes() in your configuration. > > > > Before adding set_recommended_min_free_kbytes: 5391 > After: 67584 [ add more people to the thread ] The 'before' value look low to me for machine with 2G of RAM. In the bugzilla[1], you've mentioned zram. I wounder if we need to increase min_free_kbytes when zram is in use as we do for THP. [1] https://bugzilla.kernel.org/show_bug.cgi?id=110501 -- Kirill A. Shutemov -- 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