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[PATCH] zoned vm counters: conversion of nr_dirty to per zone counter

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This makes nr_dirty a per zone counter.  Looping over all processors is
avoided during writeback state determination.

The counter aggregation for nr_dirty had to be undone in the NFS layer since
we summed up the page counts from multiple zones.  Someone more familiar with
NFS should probably review what I have done.

[[email protected]: bugfix]
Signed-off-by: Christoph Lameter <[email protected]>
Cc: Trond Myklebust <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Christoph Lameter 2006-06-30 01:55:39 -07:00 • committed by Linus Torvalds
commit b1e7a8fd85
12 changed files with 16 additions and 17 deletions
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11
mm/page-writeback.c
View file

@ -109,7 +109,7 @@ struct writeback_state
static void get_writeback_state(struct writeback_state *wbs)
{
wbs->nr_dirty = read_page_state(nr_dirty);
wbs->nr_dirty = global_page_state(NR_FILE_DIRTY);
wbs->nr_unstable = read_page_state(nr_unstable);
wbs->nr_mapped = global_page_state(NR_FILE_MAPPED) +
global_page_state(NR_ANON_PAGES);
@ -641,7 +641,8 @@ int __set_page_dirty_nobuffers(struct page *page)
if (mapping2) { /* Race with truncate? */
BUG_ON(mapping2 != mapping);
if (mapping_cap_account_dirty(mapping))
inc_page_state(nr_dirty);
__inc_zone_page_state(page,
NR_FILE_DIRTY);
radix_tree_tag_set(&mapping->page_tree,
page_index(page), PAGECACHE_TAG_DIRTY);
}
@ -728,9 +729,9 @@ int test_clear_page_dirty(struct page *page)
radix_tree_tag_clear(&mapping->page_tree,
page_index(page),
PAGECACHE_TAG_DIRTY);
write_unlock_irqrestore(&mapping->tree_lock, flags);
if (mapping_cap_account_dirty(mapping))
dec_page_state(nr_dirty);
__dec_zone_page_state(page, NR_FILE_DIRTY);
write_unlock_irqrestore(&mapping->tree_lock, flags);
return 1;
}
write_unlock_irqrestore(&mapping->tree_lock, flags);
@ -761,7 +762,7 @@ int clear_page_dirty_for_io(struct page *page)
if (mapping) {
if (TestClearPageDirty(page)) {
if (mapping_cap_account_dirty(mapping))
dec_page_state(nr_dirty);
dec_zone_page_state(page, NR_FILE_DIRTY);
return 1;
}
return 0;