From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758061AbZEYHdx (ORCPT ); Mon, 25 May 2009 03:33:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755143AbZEYHcU (ORCPT ); Mon, 25 May 2009 03:32:20 -0400 Received: from brick.kernel.dk ([93.163.65.50]:38668 "EHLO kernel.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753248AbZEYHbQ (ORCPT ); Mon, 25 May 2009 03:31:16 -0400 From: Jens Axboe To: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Cc: chris.mason@oracle.com, david@fromorbit.com, hch@infradead.org, akpm@linux-foundation.org, jack@suse.cz, yanmin_zhang@linux.intel.com, Jens Axboe Subject: [PATCH 10/12] writeback: add some debug inode list counters to bdi stats Date: Mon, 25 May 2009 09:31:03 +0200 Message-Id: <1243236668-3398-21-git-send-email-jens.axboe@oracle.com> X-Mailer: git-send-email 1.6.3.rc0.1.gf800 In-Reply-To: <1243236668-3398-1-git-send-email-jens.axboe@oracle.com> References: <1243236668-3398-1-git-send-email-jens.axboe@oracle.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add some debug entries to be able to inspect the internal state of the writeback details. Signed-off-by: Jens Axboe --- mm/backing-dev.c | 38 ++++++++++++++++++++++++++++++++++---- 1 files changed, 34 insertions(+), 4 deletions(-) diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 3a032be..fcc0b2a 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -43,9 +43,29 @@ static void bdi_debug_init(void) static int bdi_debug_stats_show(struct seq_file *m, void *v) { struct backing_dev_info *bdi = m->private; + struct bdi_writeback *wb; unsigned long background_thresh; unsigned long dirty_thresh; unsigned long bdi_thresh; + unsigned long nr_dirty, nr_io, nr_more_io, nr_wb; + struct inode *inode; + + /* + * inode lock is enough here, the bdi->wb_list is protected by + * RCU on the reader side + */ + nr_wb = nr_dirty = nr_io = nr_more_io = 0; + spin_lock(&inode_lock); + list_for_each_entry(wb, &bdi->wb_list, list) { + nr_wb++; + list_for_each_entry(inode, &wb->b_dirty, i_list) + nr_dirty++; + list_for_each_entry(inode, &wb->b_io, i_list) + nr_io++; + list_for_each_entry(inode, &wb->b_more_io, i_list) + nr_more_io++; + } + spin_unlock(&inode_lock); get_dirty_limits(&background_thresh, &dirty_thresh, &bdi_thresh, bdi); @@ -55,12 +75,22 @@ static int bdi_debug_stats_show(struct seq_file *m, void *v) "BdiReclaimable: %8lu kB\n" "BdiDirtyThresh: %8lu kB\n" "DirtyThresh: %8lu kB\n" - "BackgroundThresh: %8lu kB\n", + "BackgroundThresh: %8lu kB\n" + "WriteBack threads:%8lu\n" + "b_dirty: %8lu\n" + "b_io: %8lu\n" + "b_more_io: %8lu\n" + "bdi_list: %8u\n" + "state: %8lx\n" + "wb_mask: %8lx\n" + "wb_list: %8u\n" + "wb_cnt: %8u\n", (unsigned long) K(bdi_stat(bdi, BDI_WRITEBACK)), (unsigned long) K(bdi_stat(bdi, BDI_RECLAIMABLE)), - K(bdi_thresh), - K(dirty_thresh), - K(background_thresh)); + K(bdi_thresh), K(dirty_thresh), + K(background_thresh), nr_wb, nr_dirty, nr_io, nr_more_io, + !list_empty(&bdi->bdi_list), bdi->state, bdi->wb_mask, + !list_empty(&bdi->wb_list), bdi->wb_cnt); #undef K return 0; -- 1.6.3.rc0.1.gf800