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

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Currently a single atomic variable is used to establish the size of the page
cache in the whole machine.  The zoned VM counters have the same method of
implementation as the nr_pagecache code but also allow the determination of
the pagecache size per zone.

Remove the special implementation for nr_pagecache and make it a zoned counter
named NR_FILE_PAGES.

Updates of the page cache counters are always performed with interrupts off.
We can therefore use the __ variant here.

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 01:55:35 -07:00 • committed by Linus Torvalds
commit 347ce434d5
13 changed files with 16 additions and 67 deletions
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4
mm/filemap.c
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@ -120,7 +120,7 @@ void __remove_from_page_cache(struct page *page)
radix_tree_delete(&mapping->page_tree, page->index);
page->mapping = NULL;
mapping->nrpages--;
pagecache_acct(-1);
__dec_zone_page_state(page, NR_FILE_PAGES);
}
void remove_from_page_cache(struct page *page)
@ -449,7 +449,7 @@ int add_to_page_cache(struct page *page, struct address_space *mapping,
page->mapping = mapping;
page->index = offset;
mapping->nrpages++;
pagecache_acct(1);
__inc_zone_page_state(page, NR_FILE_PAGES);
}
write_unlock_irq(&mapping->tree_lock);
radix_tree_preload_end();