From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754225Ab3JCAxH (ORCPT ); Wed, 2 Oct 2013 20:53:07 -0400 Received: from mail-pd0-f175.google.com ([209.85.192.175]:62058 "EHLO mail-pd0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753442Ab3JCAw1 (ORCPT ); Wed, 2 Oct 2013 20:52:27 -0400 From: John Stultz To: LKML Cc: Minchan Kim , Andrew Morton , Android Kernel Team , Robert Love , Mel Gorman , Hugh Dickins , Dave Hansen , Rik van Riel , Dmitry Adamushko , Dave Chinner , Neil Brown , Andrea Righi , Andrea Arcangeli , "Aneesh Kumar K.V" , Mike Hommey , Taras Glek , Dhaval Giani , Jan Kara , KOSAKI Motohiro , Michel Lespinasse , Rob Clark , "linux-mm@kvack.org" , John Stultz Subject: [PATCH 12/14] vrange: Support background purging for vrange-file Date: Wed, 2 Oct 2013 17:51:41 -0700 Message-Id: <1380761503-14509-13-git-send-email-john.stultz@linaro.org> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1380761503-14509-1-git-send-email-john.stultz@linaro.org> References: <1380761503-14509-1-git-send-email-john.stultz@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Minchan Kim Add support to purge vrange file pages via the shrinker interface. This is useful, since some filesystems like shmem/tmpfs use anonymous pages, which won't be aged off the page LRU if swap is disabled. Cc: Andrew Morton Cc: Android Kernel Team Cc: Robert Love Cc: Mel Gorman Cc: Hugh Dickins Cc: Dave Hansen Cc: Rik van Riel Cc: Dmitry Adamushko Cc: Dave Chinner Cc: Neil Brown Cc: Andrea Righi Cc: Andrea Arcangeli Cc: Aneesh Kumar K.V Cc: Mike Hommey Cc: Taras Glek Cc: Dhaval Giani Cc: Jan Kara Cc: KOSAKI Motohiro Cc: Michel Lespinasse Cc: Rob Clark Cc: Minchan Kim Cc: linux-mm@kvack.org Signed-off-by: Minchan Kim [jstultz: Commit message tweaks] Signed-off-by: John Stultz --- mm/vrange.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 49 insertions(+), 7 deletions(-) diff --git a/mm/vrange.c b/mm/vrange.c index c6bc32f..3f21dc9 100644 --- a/mm/vrange.c +++ b/mm/vrange.c @@ -13,6 +13,7 @@ #include #include #include +#include static struct kmem_cache *vrange_cachep; @@ -854,21 +855,62 @@ out: return ret; } +static int __discard_vrange_file(struct address_space *mapping, + struct vrange *vrange, unsigned int *ret_discard) +{ + struct pagevec pvec; + pgoff_t index; + int i; + unsigned int nr_discard = 0; + unsigned long start_idx = vrange->node.start; + unsigned long end_idx = vrange->node.last; + const pgoff_t start = start_idx >> PAGE_CACHE_SHIFT; + pgoff_t end = end_idx >> PAGE_CACHE_SHIFT; + LIST_HEAD(pagelist); + + pagevec_init(&pvec, 0); + index = start; + while (index <= end && pagevec_lookup(&pvec, mapping, index, + min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1)) { + for (i = 0; i < pagevec_count(&pvec); i++) { + struct page *page = pvec.pages[i]; + index = page->index; + if (index > end) + break; + if (isolate_lru_page(page)) + continue; + list_add(&page->lru, &pagelist); + inc_zone_page_state(page, NR_ISOLATED_ANON); + } + pagevec_release(&pvec); + cond_resched(); + index++; + } + + if (!list_empty(&pagelist)) + nr_discard = discard_vrange_pagelist(&pagelist); + + *ret_discard = nr_discard; + putback_lru_pages(&pagelist); + + return 0; +} + static int discard_vrange(struct vrange *vrange) { int ret = 0; - struct mm_struct *mm; struct vrange_root *vroot; unsigned int nr_discard = 0; vroot = vrange->owner; - /* TODO : handle VRANGE_FILE */ - if (vroot->type != VRANGE_MM) - goto out; + if (vroot->type == VRANGE_MM) { + struct mm_struct *mm = vroot->object; + ret = __discard_vrange_anon(mm, vrange, &nr_discard); + } else if (vroot->type == VRANGE_FILE) { + struct address_space *mapping = vroot->object; + ret = __discard_vrange_file(mapping, vrange, &nr_discard); + } - mm = vroot->object; - ret = __discard_vrange_anon(mm, vrange, &nr_discard); -out: return nr_discard; } -- 1.8.1.2