Messages in this thread Patch in this message | | | Date | Mon, 13 Dec 2010 14:42:56 +0800 | From | Wu Fengguang <> | Subject | [PATCH 07/47] writeback: account per-bdi accumulated written pages |
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From: Jan Kara <jack@suse.cz>
Introduce the BDI_WRITTEN counter. It will be used for estimating the bdi's write bandwidth.
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> --- include/linux/backing-dev.h | 1 + mm/backing-dev.c | 6 ++++-- mm/page-writeback.c | 1 + 3 files changed, 6 insertions(+), 2 deletions(-)
--- linux-next.orig/include/linux/backing-dev.h 2010-12-08 22:43:58.000000000 +0800 +++ linux-next/include/linux/backing-dev.h 2010-12-08 22:44:24.000000000 +0800 @@ -40,6 +40,7 @@ typedef int (congested_fn)(void *, int); enum bdi_stat_item { BDI_RECLAIMABLE, BDI_WRITEBACK, + BDI_WRITTEN, NR_BDI_STAT_ITEMS }; --- linux-next.orig/mm/backing-dev.c 2010-12-08 22:44:21.000000000 +0800 +++ linux-next/mm/backing-dev.c 2010-12-08 22:44:24.000000000 +0800 @@ -92,6 +92,7 @@ static int bdi_debug_stats_show(struct s "BdiDirtyThresh: %8lu kB\n" "DirtyThresh: %8lu kB\n" "BackgroundThresh: %8lu kB\n" + "BdiWritten: %8lu kB\n" "b_dirty: %8lu\n" "b_io: %8lu\n" "b_more_io: %8lu\n" @@ -99,8 +100,9 @@ static int bdi_debug_stats_show(struct s "state: %8lx\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), nr_dirty, nr_io, nr_more_io, + K(bdi_thresh), K(dirty_thresh), K(background_thresh), + (unsigned long) K(bdi_stat(bdi, BDI_WRITTEN)), + nr_dirty, nr_io, nr_more_io, !list_empty(&bdi->bdi_list), bdi->state); #undef K --- linux-next.orig/mm/page-writeback.c 2010-12-08 22:44:23.000000000 +0800 +++ linux-next/mm/page-writeback.c 2010-12-08 22:44:24.000000000 +0800 @@ -1329,6 +1329,7 @@ int test_clear_page_writeback(struct pag PAGECACHE_TAG_WRITEBACK); if (bdi_cap_account_writeback(bdi)) { __dec_bdi_stat(bdi, BDI_WRITEBACK); + __inc_bdi_stat(bdi, BDI_WRITTEN); __bdi_writeout_inc(bdi); } }
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