Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2992561AbbEVW0l (ORCPT ); Fri, 22 May 2015 18:26:41 -0400 Received: from mail-qk0-f176.google.com ([209.85.220.176]:36252 "EHLO mail-qk0-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2992478AbbEVWYH (ORCPT ); Fri, 22 May 2015 18:24:07 -0400 From: Tejun Heo To: axboe@kernel.dk Cc: linux-kernel@vger.kernel.org, jack@suse.cz, hch@infradead.org, hannes@cmpxchg.org, linux-fsdevel@vger.kernel.org, vgoyal@redhat.com, lizefan@huawei.com, cgroups@vger.kernel.org, linux-mm@kvack.org, mhocko@suse.cz, clm@fb.com, fengguang.wu@intel.com, david@fromorbit.com, gthelen@google.com, khlebnikov@yandex-team.ru, Tejun Heo Subject: [PATCH 14/19] writeback: move over_bground_thresh() to mm/page-writeback.c Date: Fri, 22 May 2015 18:23:31 -0400 Message-Id: <1432333416-6221-15-git-send-email-tj@kernel.org> X-Mailer: git-send-email 2.4.0 In-Reply-To: <1432333416-6221-1-git-send-email-tj@kernel.org> References: <1432333416-6221-1-git-send-email-tj@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3875 Lines: 120 and rename it to wb_over_bg_thresh(). The function is closely tied to the dirty throttling mechanism implemented in page-writeback.c. This relocation will allow future updates necessary for cgroup writeback support. While at it, add function comment. This is pure reorganization and doesn't introduce any behavioral changes. Signed-off-by: Tejun Heo Cc: Jens Axboe Cc: Jan Kara Cc: Wu Fengguang Cc: Greg Thelen --- fs/fs-writeback.c | 20 ++------------------ include/linux/writeback.h | 1 + mm/page-writeback.c | 23 +++++++++++++++++++++++ 3 files changed, 26 insertions(+), 18 deletions(-) diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 51c8a5b..da35587 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -1071,22 +1071,6 @@ static long writeback_inodes_wb(struct bdi_writeback *wb, long nr_pages, return nr_pages - work.nr_pages; } -static bool over_bground_thresh(struct bdi_writeback *wb) -{ - unsigned long background_thresh, dirty_thresh; - - global_dirty_limits(&background_thresh, &dirty_thresh); - - if (global_page_state(NR_FILE_DIRTY) + - global_page_state(NR_UNSTABLE_NFS) > background_thresh) - return true; - - if (wb_stat(wb, WB_RECLAIMABLE) > wb_calc_thresh(wb, background_thresh)) - return true; - - return false; -} - /* * Explicit flushing or periodic writeback of "old" data. * @@ -1136,7 +1120,7 @@ static long wb_writeback(struct bdi_writeback *wb, * For background writeout, stop when we are below the * background dirty threshold */ - if (work->for_background && !over_bground_thresh(wb)) + if (work->for_background && !wb_over_bg_thresh(wb)) break; /* @@ -1227,7 +1211,7 @@ static unsigned long get_nr_dirty_pages(void) static long wb_check_background_flush(struct bdi_writeback *wb) { - if (over_bground_thresh(wb)) { + if (wb_over_bg_thresh(wb)) { struct wb_writeback_work work = { .nr_pages = LONG_MAX, diff --git a/include/linux/writeback.h b/include/linux/writeback.h index 5fdd4e1..b57c2786 100644 --- a/include/linux/writeback.h +++ b/include/linux/writeback.h @@ -207,6 +207,7 @@ unsigned long wb_calc_thresh(struct bdi_writeback *wb, unsigned long thresh); void wb_update_bandwidth(struct bdi_writeback *wb, unsigned long start_time); void page_writeback_init(void); void balance_dirty_pages_ratelimited(struct address_space *mapping); +bool wb_over_bg_thresh(struct bdi_writeback *wb); typedef int (*writepage_t)(struct page *page, struct writeback_control *wbc, void *data); diff --git a/mm/page-writeback.c b/mm/page-writeback.c index c8ac8ce..9d9a896 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -1740,6 +1740,29 @@ void balance_dirty_pages_ratelimited(struct address_space *mapping) } EXPORT_SYMBOL(balance_dirty_pages_ratelimited); +/** + * wb_over_bg_thresh - does @wb need to be written back? + * @wb: bdi_writeback of interest + * + * Determines whether background writeback should keep writing @wb or it's + * clean enough. Returns %true if writeback should continue. + */ +bool wb_over_bg_thresh(struct bdi_writeback *wb) +{ + unsigned long background_thresh, dirty_thresh; + + global_dirty_limits(&background_thresh, &dirty_thresh); + + if (global_page_state(NR_FILE_DIRTY) + + global_page_state(NR_UNSTABLE_NFS) > background_thresh) + return true; + + if (wb_stat(wb, WB_RECLAIMABLE) > wb_calc_thresh(wb, background_thresh)) + return true; + + return false; +} + void throttle_vm_writeout(gfp_t gfp_mask) { unsigned long background_thresh; -- 2.4.0 -- 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/