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Commit c8e28ce0 authored by Wu Fengguang's avatar Wu Fengguang
Browse files

writeback: account per-bdi accumulated dirtied pages 



Introduce the BDI_DIRTIED counter. It will be used for estimating the
bdi's dirty bandwidth.

CC: Jan Kara <jack@suse.cz>
CC: Michael Rubin <mrubin@google.com>
CC: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: default avatarWu Fengguang <fengguang.wu@intel.com>
parent 9b137769

include/linux/backing-dev.h

+1 −0
Original line number Diff line number Diff line
@@ -40,6 +40,7 @@ typedef int (congested_fn)(void *, int); 
enum bdi_stat_item {

	BDI_RECLAIMABLE,

	BDI_WRITEBACK,

	BDI_DIRTIED,

	BDI_WRITTEN,

	NR_BDI_STAT_ITEMS

};

mm/backing-dev.c

+2 −0
Original line number Diff line number Diff line
@@ -97,6 +97,7 @@ static int bdi_debug_stats_show(struct seq_file *m, void *v) 
		   "BdiDirtyThresh:     %10lu kB\n"

		   "DirtyThresh:        %10lu kB\n"

		   "BackgroundThresh:   %10lu kB\n"

		   "BdiDirtied:         %10lu kB\n"

		   "BdiWritten:         %10lu kB\n"

		   "BdiWriteBandwidth:  %10lu kBps\n"

		   "b_dirty:            %10lu\n"
@@ -109,6 +110,7 @@ static int bdi_debug_stats_show(struct seq_file *m, void *v) 
		   K(bdi_thresh),

		   K(dirty_thresh),

		   K(background_thresh),

		   (unsigned long) K(bdi_stat(bdi, BDI_DIRTIED)),

		   (unsigned long) K(bdi_stat(bdi, BDI_WRITTEN)),

		   (unsigned long) K(bdi->write_bandwidth),

		   nr_dirty,

mm/page-writeback.c

+1 −0
Original line number Diff line number Diff line
@@ -1322,6 +1322,7 @@ void account_page_dirtied(struct page *page, struct address_space *mapping) 
		__inc_zone_page_state(page, NR_FILE_DIRTY);

		__inc_zone_page_state(page, NR_DIRTIED);

		__inc_bdi_stat(mapping->backing_dev_info, BDI_RECLAIMABLE);

		__inc_bdi_stat(mapping->backing_dev_info, BDI_DIRTIED);

		task_dirty_inc(current);

		task_io_account_write(PAGE_CACHE_SIZE);

	}