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mm: bdi: add separate writeback accounting capability

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Add a new BDI capability flag: BDI_CAP_NO_ACCT_WB.  If this flag is
set, then don't update the per-bdi writeback stats from
test_set_page_writeback() and test_clear_page_writeback().

Misc cleanups:

 - convert bdi_cap_writeback_dirty() and friends to static inline functions
 - create a flag that includes all three dirty/writeback related flags,
   since almst all users will want to have them toghether

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Miklos Szeredi
2008-04-30 00:54:37 -07:00
committed by Linus Torvalds
parent 76f1418b48
commit e4ad08fe64
10 changed files with 67 additions and 30 deletions
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4
mm/page-writeback.c
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@@ -1246,7 +1246,7 @@ int test_clear_page_writeback(struct page *page)
radix_tree_tag_clear(&mapping->page_tree,
page_index(page),
PAGECACHE_TAG_WRITEBACK);
if (bdi_cap_writeback_dirty(bdi)) {
if (bdi_cap_account_writeback(bdi)) {
__dec_bdi_stat(bdi, BDI_WRITEBACK);
__bdi_writeout_inc(bdi);
}
@@ -1275,7 +1275,7 @@ int test_set_page_writeback(struct page *page)
radix_tree_tag_set(&mapping->page_tree,
page_index(page),
PAGECACHE_TAG_WRITEBACK);
if (bdi_cap_writeback_dirty(bdi))
if (bdi_cap_account_writeback(bdi))
__inc_bdi_stat(bdi, BDI_WRITEBACK);
}
if (!PageDirty(page))

2
mm/shmem.c
View File

@@ -201,7 +201,7 @@ static struct vm_operations_struct shmem_vm_ops;
static struct backing_dev_info shmem_backing_dev_info __read_mostly = {
.ra_pages = 0, /* No readahead */
.capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
.capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
.unplug_io_fn = default_unplug_io_fn,
};

2
mm/swap_state.c
View File

@@ -33,7 +33,7 @@ static const struct address_space_operations swap_aops = {
};
static struct backing_dev_info swap_backing_dev_info = {
.capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
.capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
.unplug_io_fn = swap_unplug_io_fn,
};