Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753372AbbF3OR5 (ORCPT ); Tue, 30 Jun 2015 10:17:57 -0400 Received: from cantor2.suse.de ([195.135.220.15]:56833 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753505AbbF3ORt (ORCPT ); Tue, 30 Jun 2015 10:17:49 -0400 Date: Tue, 30 Jun 2015 16:17:42 +0200 From: Jan Kara To: Tejun Heo Cc: axboe@kernel.dk, 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 Subject: Re: [PATCH 25/51] writeback: attribute stats to the matching per-cgroup bdi_writeback Message-ID: <20150630141742.GK7252@quack.suse.cz> References: <1432329245-5844-1-git-send-email-tj@kernel.org> <1432329245-5844-26-git-send-email-tj@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1432329245-5844-26-git-send-email-tj@kernel.org> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4175 Lines: 115 On Fri 22-05-15 17:13:39, Tejun Heo wrote: > Until now, all WB_* stats were accounted against the root wb > (bdi_writeback), now that multiple wb (bdi_writeback) support is in > place, let's attributes the stats to the respective per-cgroup wb's. > > As no filesystem has FS_CGROUP_WRITEBACK yet, this doesn't lead to > visible behavior differences. > > v2: Updated for per-inode wb association. > > Signed-off-by: Tejun Heo > Cc: Jens Axboe > Cc: Jan Kara Looks good. You can add: Reviewed-by: Jan Kara Honza > --- > mm/page-writeback.c | 24 +++++++++++++++--------- > 1 file changed, 15 insertions(+), 9 deletions(-) > > diff --git a/mm/page-writeback.c b/mm/page-writeback.c > index 9b95cf8..4d0a9da 100644 > --- a/mm/page-writeback.c > +++ b/mm/page-writeback.c > @@ -2130,7 +2130,7 @@ void account_page_cleaned(struct page *page, struct address_space *mapping, > if (mapping_cap_account_dirty(mapping)) { > mem_cgroup_dec_page_stat(memcg, MEM_CGROUP_STAT_DIRTY); > dec_zone_page_state(page, NR_FILE_DIRTY); > - dec_wb_stat(&inode_to_bdi(mapping->host)->wb, WB_RECLAIMABLE); > + dec_wb_stat(inode_to_wb(mapping->host), WB_RECLAIMABLE); > task_io_account_cancelled_write(PAGE_CACHE_SIZE); > } > } > @@ -2191,10 +2191,13 @@ EXPORT_SYMBOL(__set_page_dirty_nobuffers); > void account_page_redirty(struct page *page) > { > struct address_space *mapping = page->mapping; > + > if (mapping && mapping_cap_account_dirty(mapping)) { > + struct bdi_writeback *wb = inode_to_wb(mapping->host); > + > current->nr_dirtied--; > dec_zone_page_state(page, NR_DIRTIED); > - dec_wb_stat(&inode_to_bdi(mapping->host)->wb, WB_DIRTIED); > + dec_wb_stat(wb, WB_DIRTIED); > } > } > EXPORT_SYMBOL(account_page_redirty); > @@ -2373,8 +2376,7 @@ int clear_page_dirty_for_io(struct page *page) > if (TestClearPageDirty(page)) { > mem_cgroup_dec_page_stat(memcg, MEM_CGROUP_STAT_DIRTY); > dec_zone_page_state(page, NR_FILE_DIRTY); > - dec_wb_stat(&inode_to_bdi(mapping->host)->wb, > - WB_RECLAIMABLE); > + dec_wb_stat(inode_to_wb(mapping->host), WB_RECLAIMABLE); > ret = 1; > } > mem_cgroup_end_page_stat(memcg); > @@ -2392,7 +2394,8 @@ int test_clear_page_writeback(struct page *page) > > memcg = mem_cgroup_begin_page_stat(page); > if (mapping) { > - struct backing_dev_info *bdi = inode_to_bdi(mapping->host); > + struct inode *inode = mapping->host; > + struct backing_dev_info *bdi = inode_to_bdi(inode); > unsigned long flags; > > spin_lock_irqsave(&mapping->tree_lock, flags); > @@ -2402,8 +2405,10 @@ int test_clear_page_writeback(struct page *page) > page_index(page), > PAGECACHE_TAG_WRITEBACK); > if (bdi_cap_account_writeback(bdi)) { > - __dec_wb_stat(&bdi->wb, WB_WRITEBACK); > - __wb_writeout_inc(&bdi->wb); > + struct bdi_writeback *wb = inode_to_wb(inode); > + > + __dec_wb_stat(wb, WB_WRITEBACK); > + __wb_writeout_inc(wb); > } > } > spin_unlock_irqrestore(&mapping->tree_lock, flags); > @@ -2427,7 +2432,8 @@ int __test_set_page_writeback(struct page *page, bool keep_write) > > memcg = mem_cgroup_begin_page_stat(page); > if (mapping) { > - struct backing_dev_info *bdi = inode_to_bdi(mapping->host); > + struct inode *inode = mapping->host; > + struct backing_dev_info *bdi = inode_to_bdi(inode); > unsigned long flags; > > spin_lock_irqsave(&mapping->tree_lock, flags); > @@ -2437,7 +2443,7 @@ int __test_set_page_writeback(struct page *page, bool keep_write) > page_index(page), > PAGECACHE_TAG_WRITEBACK); > if (bdi_cap_account_writeback(bdi)) > - __inc_wb_stat(&bdi->wb, WB_WRITEBACK); > + __inc_wb_stat(inode_to_wb(inode), WB_WRITEBACK); > } > if (!PageDirty(page)) > radix_tree_tag_clear(&mapping->page_tree, > -- > 2.4.0 > -- Jan Kara SUSE Labs, CR -- 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/