Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751596AbaABHOF (ORCPT ); Thu, 2 Jan 2014 02:14:05 -0500 Received: from LGEMRELSE7Q.lge.com ([156.147.1.151]:61829 "EHLO LGEMRELSE7Q.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751432AbaABHNQ (ORCPT ); Thu, 2 Jan 2014 02:13:16 -0500 X-AuditID: 9c930197-b7c4aae000003d84-3c-52c51189fe2f From: Minchan Kim To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Andrew Morton , Mel Gorman , Hugh Dickins , Dave Hansen , Rik van Riel , KOSAKI Motohiro , Michel Lespinasse , Johannes Weiner , John Stultz , Dhaval Giani , "H. Peter Anvin" , Android Kernel Team , Robert Love , Mel Gorman , Dmitry Adamushko , Dave Chinner , Neil Brown , Andrea Righi , Andrea Arcangeli , "Aneesh Kumar K.V" , Mike Hommey , Taras Glek , Jan Kara , KOSAKI Motohiro , Rob Clark , Jason Evans , Minchan Kim Subject: [PATCH v10 12/16] vrange: Support background purging for vrange-file Date: Thu, 2 Jan 2014 16:12:20 +0900 Message-Id: <1388646744-15608-13-git-send-email-minchan@kernel.org> X-Mailer: git-send-email 1.8.5.2 In-Reply-To: <1388646744-15608-1-git-send-email-minchan@kernel.org> References: <1388646744-15608-1-git-send-email-minchan@kernel.org> X-Brightmail-Tracker: AAAAAA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3214 Lines: 112 Add support to purge vrange file pages. 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: Mel Gorman Cc: Hugh Dickins Cc: Dave Hansen Cc: Rik van Riel Cc: KOSAKI Motohiro Cc: Michel Lespinasse Cc: Johannes Weiner [jstultz: Commit message tweaks] Signed-off-by: John Stultz Signed-off-by: Minchan Kim --- mm/vrange.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 49 insertions(+), 8 deletions(-) diff --git a/mm/vrange.c b/mm/vrange.c index ed89835bcff4..51875f256592 100644 --- a/mm/vrange.c +++ b/mm/vrange.c @@ -13,6 +13,7 @@ #include #include #include +#include #include static struct kmem_cache *vrange_cachep; @@ -853,24 +854,64 @@ out: return ret; } +static int __discard_vrange_file(struct address_space *mapping, + struct vrange *vrange, unsigned long *ret_discard) +{ + struct pagevec pvec; + pgoff_t index; + int i, ret = 0; + unsigned long 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 ret; +} + static int discard_vrange(struct vrange *vrange, unsigned long *nr_discard) { int ret = 0; - struct mm_struct *mm; struct vrange_root *vroot; 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 ret; } - #define VRANGE_SCAN_THRESHOLD (4 << 20) unsigned long shrink_vrange(enum lru_list lru, struct lruvec *lruvec, -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/