linux-stable.git/include/linux/page-flags.h, branch linux-2.6.17.y

[PATCH] page flags: add commentry regarding field reservation

2006-04-11T13:18:32+00:00

Add some documentation regarding the utilisation of the flags field in
struct page.  This field is overloaded for per page bits and to hold node,
zone and SPARSEMEM information.  Make it clear which areas are used for
what and how many bits are in each area.

Signed-off-by: Andy Whitcroft 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] Fix buddy list race that could lead to page lru list corruptions

2006-04-10T17:16:37+00:00

Rohit found an obscure bug causing buddy list corruption.

page_is_buddy is using a non-atomic test (PagePrivate && page_count == 0)
to determine whether or not a free page's buddy is itself free and in the
buddy lists.

Each of the conjuncts may be true at different times due to unrelated
conditions, so the non-atomic page_is_buddy test may find each conjunct to
be true even if they were not both true at the same time (ie. the page was
not on the buddy lists).

Signed-off-by: Martin Bligh 
Signed-off-by: Rohit Seth 
Signed-off-by: Nick Piggin 
Signed-off-by: KAMEZAWA Hiroyuki 
Signed-off-by: Linus Torvalds

[PATCH] mm: page_state comment more

2006-03-22T15:53:58+00:00

Clarify that preemption needs to be guarded against with the
__xxx_page_state functions.

Signed-off-by: Nick Piggin 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] mm: slab less atomics

2006-03-22T15:53:57+00:00

Atomic operation removal from slab

Signed-off-by: Nick Piggin 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] mm: page_alloc less atomics

2006-03-22T15:53:57+00:00

More atomic operation removal from page allocator

Signed-off-by: Nick Piggin 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] mm: less atomic ops

2006-03-22T15:53:57+00:00

In the page release paths, we can be sure that nobody will mess with our
page->flags because the refcount has dropped to 0.  So no need for atomic
operations here.

Signed-off-by: Nick Piggin 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] mm: PageActive no testset

2006-03-22T15:53:57+00:00

PG_active is protected by zone->lru_lock, it does not need TestSet/TestClear
operations.

Signed-off-by: Nick Piggin 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] mm: PageLRU no testset

2006-03-22T15:53:56+00:00

PG_lru is protected by zone->lru_lock. It does not need TestSet/TestClear
operations.

Signed-off-by: Nick Piggin 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] mm: page_state opt docs

2006-01-06T16:33:29+00:00

Comment the new locking rules for page_state statistics.

Signed-off-by: Nick Piggin 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] mm: page_state opt

2006-01-06T16:33:29+00:00

Optimise page_state manipulations by introducing interrupt unsafe accessors
to page_state fields.  Callers must provide their own locking (either
disable interrupts or not update from interrupt context).

Switch over the hot callsites that can easily be moved under interrupts off
sections.

Signed-off-by: Nick Piggin 
Cc: Hugh Dickins 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds