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[PATCH] mm: page_state opt docs

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Comment the new locking rules for page_state statistics.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Nick Piggin 2006-01-06 00:11:21 -08:00 committed by Linus Torvalds
parent a74609fafa
commit b09eb1c06a
1 changed files with 11 additions and 1 deletions
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12
include/linux/page-flags.h
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@ -79,13 +79,23 @@
/* /*
* Global page accounting. One instance per CPU. Only unsigned longs are * Global page accounting. One instance per CPU. Only unsigned longs are
* allowed. * allowed.
*
* - Fields can be modified with xxx_page_state and xxx_page_state_zone at
* any time safely (which protects the instance from modification by
* interrupt.
* - The __xxx_page_state variants can be used safely when interrupts are
* disabled.
* - The __xxx_page_state variants can be used if the field is only
* modified from process context, or only modified from interrupt context.
* In this case, the field should be commented here.
*/ */
struct page_state { struct page_state {
unsigned long nr_dirty; /* Dirty writeable pages */ unsigned long nr_dirty; /* Dirty writeable pages */
unsigned long nr_writeback; /* Pages under writeback */ unsigned long nr_writeback; /* Pages under writeback */
unsigned long nr_unstable; /* NFS unstable pages */ unsigned long nr_unstable; /* NFS unstable pages */
unsigned long nr_page_table_pages;/* Pages used for pagetables */ unsigned long nr_page_table_pages;/* Pages used for pagetables */
unsigned long nr_mapped; /* mapped into pagetables */ unsigned long nr_mapped; /* mapped into pagetables.
* only modified from process context */
unsigned long nr_slab; /* In slab */ unsigned long nr_slab; /* In slab */
#define GET_PAGE_STATE_LAST nr_slab #define GET_PAGE_STATE_LAST nr_slab