From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754734Ab1GEIXm (ORCPT ); Tue, 5 Jul 2011 04:23:42 -0400 Received: from e23smtp06.au.ibm.com ([202.81.31.148]:34481 "EHLO e23smtp06.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754699Ab1GEIXH (ORCPT ); Tue, 5 Jul 2011 04:23:07 -0400 From: Ankita Garg To: linux-mm@kvack.org Cc: ankita@in.ibm.com, svaidy@linux.vnet.ibm.com, linux-kernel@vger.kernel.org Subject: [PATCH 4/5] Capture references to page cache pages Date: Tue, 5 Jul 2011 13:52:38 +0530 Message-Id: <1309854159-8277-5-git-send-email-ankita@in.ibm.com> X-Mailer: git-send-email 1.7.4 In-Reply-To: <1309854159-8277-1-git-send-email-ankita@in.ibm.com> References: <1309854159-8277-1-git-send-email-ankita@in.ibm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, Page cache accesses may not be mapped, hence fake an access when a pagecache page is looked up, by marking the corresponding memory address block as accessed. Signed-off-by: Ankita Garg --- mm/filemap.c | 8 ++++++++ 1 files changed, 8 insertions(+), 0 deletions(-) diff --git a/mm/filemap.c b/mm/filemap.c index a8251a8..7ae7f36 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -36,6 +36,7 @@ #include /* for page_is_file_cache() */ #include #include "internal.h" +#include /* * FIXME: remove all knowledge of the buffer layer from the core VM @@ -730,6 +731,13 @@ repeat: page_cache_release(page); goto repeat; } +#if defined(CONFIG_MEMTRACE) + if(get_pg_trace_pid() != -1 && current->mem_trace) { + unsigned long pfn = page_to_pfn(page); + if(pfn_valid(pfn)) + mark_memtrace_block_accessed(pfn << PAGE_SHIFT); + } +#endif } out: rcu_read_unlock(); -- 1.7.4