> > The output format is quite different from /proc/vmstat.
> > Do we really need to "Node X", ":" and "times" decorations?
>
> Node X is based on the meminfo file but I agree it's redundant information.
Thanks. In the same directory you can find a different style example
/sys/devices/system/node/node0/numastat :) If ever the file was named
vmstat! In the other hand, shall we put the numbers there? I'm confused..
> > And the "_PAGES" in NR_FILE_PAGES_DIRTIED looks redundant to
> > the "_page" in node_page_state(). It's a bit long to be a pleasant
> > name. NR_FILE_DIRTIED/NR_CLEANED looks nicer.
>
> Yeah. Will fix.
Thanks. This is kind of nitpick, however here is another name by
Jan Kara: BDI_WRITTEN. BDI_WRITTEN may not be a lot better than
BDI_CLEANED, but here is a patch based on Jan's code. I'm cooking
more patches that make use of this per-bdi counter to estimate the
bdi's write bandwidth, and to further decide the optimal (large)
writeback chunk size as well as to do IO-less balance_dirty_pages().
Basically BDI_WRITTEN and NR_CLEANED are accounting for the same
thing in different dimensions. So it would be good if we can use
the same naming scheme to avoid confusing users: either to use
BDI_WRITTEN and NR_WRITTEN, or use BDI_CLEANED and NR_CLEANED.
What's your opinion?
Thanks,
Fengguang
---
writeback: account per-bdi accumulated written pages
This steals code from Jan's balance_dirty_pages() patch.
Signed-off-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
---
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 2010-08-29 23:32:46.000000000 +0800
+++ linux-next/include/linux/backing-dev.h 2010-08-29 23:52:50.000000000 +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 2010-08-29 23:32:46.000000000 +0800
+++ linux-next/mm/backing-dev.c 2010-08-29 23:52:50.000000000 +0800
@@ -91,6 +91,7 @@ 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"
@@ -98,8 +99,9 @@ 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 2010-08-29 23:52:47.000000000 +0800
+++ linux-next/mm/page-writeback.c 2010-08-29 23:52:50.000000000 +0800
@@ -1305,6 +1305,7 @@ 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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