From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail137.messagelabs.com (mail137.messagelabs.com [216.82.249.19]) by kanga.kvack.org (Postfix) with ESMTP id 9B5136B007B for ; Tue, 16 Feb 2010 16:32:24 -0500 (EST) Message-ID: <4B7B0D75.50808@nortel.com> Date: Tue, 16 Feb 2010 15:26:13 -0600 From: "Chris Friesen" MIME-Version: 1.0 Subject: Re: tracking memory usage/leak in "inactive" field in /proc/meminfo? References: <4B71927D.6030607@nortel.com> <20100210093140.12D9.A69D9226@jp.fujitsu.com> <4B72E74C.9040001@nortel.com> <28c262361002101645g3fd08cc7t6a72d27b1f94db62@mail.gmail.com> <4B74524D.8080804@nortel.com> <28c262361002111838q7db763feh851a9bea4fdd9096@mail.gmail.com> <4B7504D2.1040903@nortel.com> <4B796D31.7030006@nortel.com> <4B797D93.5090307@redhat.com> <4B7ACD4A.10101@nortel.com> <4B7AD207.20604@redhat.com> In-Reply-To: <4B7AD207.20604@redhat.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Rik van Riel Cc: Minchan Kim , KOSAKI Motohiro , Linux Kernel Mailing List , linux-mm@kvack.org, Balbir Singh List-ID: On 02/16/2010 11:12 AM, Rik van Riel wrote: > On 02/16/2010 11:52 AM, Chris Friesen wrote: >> On 02/15/2010 11:00 AM, Rik van Riel wrote: > >>> Removal from the LRU is done from the page freeing code, on >>> the final free of the page. > >> There are a bunch of inline functions involved, but I think the chain >> from page_remove_rmap() back up to unmap_vmas() looks like this: >> >> page_remove_rmap >> zap_pte_range >> zap_pmd_range >> zap_pud_range >> unmap_page_range >> unmap_vmas >> >> So in this scenario, where do the pages actually get removed from the >> LRU list (assuming that they're not in use by anyone else)? > > __page_cache_release For the backtrace scenario I posted it seems like it might actually be release_pages(). There seems to be a plausible call chain: __ClearPageLRU release_pages free_pages_and_swap_cache tlb_flush_mmu tlb_remove_page zap_pte_range Does that seem right? In this case, tlb_remove_page() is called right after page_remove_rmap() which ultimately results in clearing the PageAnon bit. Chris -- 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