From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f47.google.com (mail-pa0-f47.google.com [209.85.220.47]) by kanga.kvack.org (Postfix) with ESMTP id 55BBF6B0055 for ; Thu, 2 Jan 2014 02:13:21 -0500 (EST) Received: by mail-pa0-f47.google.com with SMTP id kq14so14104971pab.6 for ; Wed, 01 Jan 2014 23:13:21 -0800 (PST) Received: from LGEMRELSE7Q.lge.com (LGEMRELSE7Q.lge.com. [156.147.1.151]) by mx.google.com with ESMTP id gm1si15344151pac.100.2014.01.01.23.13.18 for ; Wed, 01 Jan 2014 23:13:19 -0800 (PST) From: 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> In-Reply-To: <1388646744-15608-1-git-send-email-minchan@kernel.org> References: <1388646744-15608-1-git-send-email-minchan@kernel.org> Sender: owner-linux-mm@kvack.org List-ID: 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 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, 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