- 22 Mar, 2006 40 commits
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Wu Fengguang authored
In isolate_lru_pages(), *scanned reports one more scan because the scan counter is increased one more time on exit of the while-loop. Change the while-loop to for-loop to fix it. Signed-off-by:
Nick Piggin <npiggin@suse.de> Signed-off-by:
Wu Fengguang <wfg@mail.ustc.edu.cn> Signed-off-by:
Andrew Morton <akpm@osdl.org> Signed-off-by:
Linus Torvalds <torvalds@osdl.org>
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Christoph Lameter authored
Add some comments to explain how zone reclaim works. And it fixes the following issues: - PF_SWAPWRITE needs to be set for RECLAIM_SWAP to be able to write out pages to swap. Currently RECLAIM_SWAP may not do that. - remove setting nr_reclaimed pages after slab reclaim since the slab shrinking code does not use that and the nr_reclaimed pages is just right for the intended follow up action. Signed-off-by:
Christoph Lameter <clameter@sgi.com> Signed-off-by:
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Andrew Morton authored
We have: try_to_free_pages ->shrink_caches(struct zone **zones, ..) ->shrink_zone(struct zone *, ...) ->shrink_cache(struct zone *, ...) ->shrink_list(struct list_head *, ...) ->refill_inactive_list((struct zone *, ...) which is fairly irrational. Rename things so that we have try_to_free_pages ->shrink_zones(struct zone **zones, ..) ->shrink_zone(struct zone *, ...) ->shrink_inactive_list(struct zone *, ...) ->shrink_page_list(struct list_head *, ...) ->shrink_active_list(struct zone *, ...) Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Christoph Lameter <christoph@lameter.com> Signed-off-by:
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Andrew Morton authored
Change all the vmscan functions to retunr the number-of-reclaimed pages and remove scan_conrtol.nr_reclaimed. Saves ten-odd bytes of text and makes things clearer and more consistent. The patch also changes the behaviour of zone_reclaim() when it falls back to slab shrinking. Christoph says "Setting this to one means that we will rescan and shrink the slab for each allocation if we are out of zone memory and RECLAIM_SLAB is set. Plus if we do an order 0 allocation we do not go off node as intended. "We better set this to zero. This means the allocation will go offnode despite us having potentially freed lots of memory on the zone. Future allocations can then again be done from this zone." Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Christoph Lameter <christoph@lameter.com> Signed-off-by:
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Andrew Morton authored
Turn basically everything in vmscan.c into `unsigned long'. This is to avoid the possibility that some piece of code in there might decide to operate upon more than 4G (or even 2G) of pages in one hit. This might be silly, but we'll need it one day. Cc: Christoph Lameter <clameter@sgi.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by:
Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by:
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Andrew Morton authored
Initialise as much of scan_control as possible at the declaration site. This tidies things up a bit and assures us that all unmentioned fields are zeroed out. Signed-off-by:
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Christoph Lameter authored
Make nr_to_scan and priority a parameter instead of putting it into scan control. This allows various small optimizations and IMHO makes the code easier to read. Signed-off-by:
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Andrew Morton authored
Slab duplicates on_each_cpu(). Signed-off-by:
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Andrew Morton authored
When on_each_cpu() runs the callback on other CPUs, it runs with local interrupts disabled. So we should run the function with local interrupts disabled on this CPU, too. And do the same for UP, so the callback is run in the same environment on both UP and SMP. (strictly it should do preempt_disable() too, but I think local_irq_disable is sufficiently equivalent). Also uninlines on_each_cpu(). softirq.c was the most appropriate file I could find, but it doesn't seem to justify creating a new file. Oh, and fix up that comment over (under?) x86's smp_call_function(). It drives me nuts. Signed-off-by:
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Christoph Lameter authored
SLAB_NO_REAP is documented as an option that will cause this slab not to be reaped under memory pressure. However, that is not what happens. The only thing that SLAB_NO_REAP controls at the moment is the reclaim of the unused slab elements that were allocated in batch in cache_reap(). Cache_reap() is run every few seconds independently of memory pressure. Could we remove the whole thing? Its only used by three slabs anyways and I cannot find a reason for having this option. There is an additional problem with SLAB_NO_REAP. If set then the recovery of objects from alien caches is switched off. Objects not freed on the same node where they were initially allocated will only be reused if a certain amount of objects accumulates from one alien node (not very likely) or if the cache is explicitly shrunk. (Strangely __cache_shrink does not check for SLAB_NO_REAP) Getting rid of SLAB_NO_REAP fixes the problems with alien cache freeing. Signed-off-by:
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Randy Dunlap authored
Fix kernel-doc warnings in mm/slab.c. Signed-off-by:
Randy Dunlap <rdunlap@xenotime.net> Signed-off-by:
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Pekka Enberg authored
We have struct kmem_cache now so use it instead of the old typedef. Signed-off-by:
Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by:
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Ravikiran G Thirumalai authored
Remove cachep->spinlock. Locking has moved to the kmem_list3 and most of the structures protected earlier by cachep->spinlock is now protected by the l3->list_lock. slab cache tunables like batchcount are accessed always with the cache_chain_mutex held. Patch tested on SMP and NUMA kernels with dbench processes running, constant onlining/offlining, and constant cache tuning, all at the same time. Signed-off-by:
Ravikiran Thirumalai <kiran@scalex86.org> Cc: Christoph Lameter <christoph@lameter.com> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Cc: Manfred Spraul <manfred@colorfullife.com> Signed-off-by:
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Andrew Morton authored
slab.c has become a bit revolting again. Try to repair it. - Coding style fixes - Don't do assignments-in-if-statements. - Don't typecast assignments to/from void* Signed-off-by:
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Pekka Enberg authored
Extract setup_cpu_cache() function from kmem_cache_create() to make the latter a little less complex. Signed-off-by:
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Pekka Enberg authored
Clean up the object to index mapping that has been spread around mm/slab.c. Signed-off-by:
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Adrian Bunk authored
Since size_t has the same size as a long on all architectures, it's enough for overflow checks to check against ULONG_MAX. This change could allow a compiler better optimization (especially in the n=1 case). The practical effect seems to be positive, but quite small: text data bss dec hex filename 21762380 5859870 1848928 29471178 1c1b1ca vmlinux-old 21762211 5859870 1848928 29471009 1c1b121 vmlinux-patched Signed-off-by:Adrian Bunk <bunk@stusta.de> Signed-off-by:
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Nick Piggin authored
Insert "fresh" huge pages into the hugepage allocator by the same means as they are freed back into it. This reduces code size and allows enqueue_huge_page to be inlined into the hugepage free fastpath. Eliminate occurances of hugepages on the free list with non-zero refcount. This can allow stricter refcount checks in future. Also required for lockless pagecache. Signed-off-by:
William Irwin <wli@holomorphy.com> Signed-off-by:
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Nick Piggin authored
The bootmem code added to page_alloc.c duplicated some page freeing code that it really doesn't need to because it is not so performance critical. While we're here, make prefetching work properly by actually prefetching the page we're about to use before prefetching ahead to the next one (ie. get the most important transaction started first). Also prefetch just a single page ahead rather than leaving a gap of 16. Jack Steiner reported no problems with SGI's ia64 simulator. Signed-off-by:
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Nick Piggin authored
Clarify that preemption needs to be guarded against with the __xxx_page_state functions. Signed-off-by:
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Nick Piggin authored
Have an explicit mm call to split higher order pages into individual pages. Should help to avoid bugs and be more explicit about the code's intention. Signed-off-by:
Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp> Signed-off-by:
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Nick Piggin authored
- Don't return uninitialised stack values in case of allocation failure - Don't bother clearing PageCompound because __GFP_COMP wasn't specified Increment over the pte page rather than one pte entry in pte_alloc_one_kernel - Actually increment the page pointer in pte_alloc_one - Compile fixes, typos. Signed-off-by:
Chris Zankel <chris@zankel.net> Signed-off-by:
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Nick Piggin authored
atomic_add_unless (atomic_inc_not_zero) no longer requires an offset refcount to function correctly. Signed-off-by:
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Nick Piggin authored
The VM has an interesting race where a page refcount can drop to zero, but it is still on the LRU lists for a short time. This was solved by testing a 0->1 refcount transition when picking up pages from the LRU, and dropping the refcount in that case. Instead, use atomic_add_unless to ensure we never pick up a 0 refcount page from the LRU, thus a 0 refcount page will never have its refcount elevated until it is allocated again. Signed-off-by:
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Nick Piggin authored
Atomic operation removal from slab Signed-off-by:
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Nick Piggin authored
More atomic operation removal from page allocator Signed-off-by:
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Nick Piggin authored
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:
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Nick Piggin authored
PG_active is protected by zone->lru_lock, it does not need TestSet/TestClear operations. Signed-off-by:
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Nick Piggin authored
PG_lru is protected by zone->lru_lock. It does not need TestSet/TestClear operations. Signed-off-by:
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Nick Piggin authored
If vmscan finds a zero refcount page on the lru list, never ClearPageLRU it. This means the release code need not hold ->lru_lock to stabilise PageLRU, so that lock may be skipped entirely when releasing !PageLRU pages (because we know PageLRU won't have been temporarily cleared by vmscan, which was previously guaranteed by holding the lock to synchronise against vmscan). Signed-off-by:
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Christoph Hellwig authored
set_pgdir isn't needed anymore for a very long time. Remove the leftover implementation on sh64 and the stub on s390. Signed-off-by:
Christoph Hellwig <hch@lst.de> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Richard Curnow <rc@rc0.org.uk> Signed-off-by:
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Dmitry Torokhov authored
Do not use platform_device_register_simple() as it is going away, define dcdbas_driver and implement ->probe() and ->remove() functions so manual binding and unbinding will work with this driver. Also switch to using attribute_group when creating sysfs attributes and make sure to check and handle errors; explicitely remove attributes when detaching driver. Signed-off-by:
Dmitry Torokhov <dtor@mail.ru> Signed-off-by:
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Dmitry Torokhov authored
Do not use platform_device_register_simple() as it is going away. Signed-off-by:
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Dmitry Torokhov authored
mv64x600_wdt: convert to the new platform device interface Do not use platform_device_register_simple() as it is going away. Signed-off-by:
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Dmitry Torokhov authored
The patch does the following for v441xx seris drivers: - stop using platform_device_register_simple() as it is going away - mark ->probe() and ->remove() methods as __devinit and __devexit respectively - initialize "owner" field in driver structure so there is a link from /sys/modules to the driver - mark *_init() and *_exit() functions as __init and __exit Signed-off-by:
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Andrew Morton authored
Sam's tree includes a new check, which found that we're exporting strpbrk() multiple times. It seems that the convention is that this is exported from the arch files, so reove the lib/string.c export. Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: David Howells <dhowells@redhat.com> Cc: Greg Ungerer <gerg@uclinux.org> Signed-off-by:
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Atsushi Nemoto authored
Update the serial_txx9 driver. * More strict check in verify_port. Cleanup. * Do not insert a char caused previous overrun. * Fix some spin_locks. * Do not call uart_add_one_port for absent ports. Also, this patch removes a BROKEN tag from Kconfig. This driver has been marked as BROKEN by removal of uart_register_port, but it has been solved already on Sep 2005. Signed-off-by:
Atsushi Nemoto <anemo@mba.ocn.ne.jp> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by:
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Joe Korty authored
Git patch 52dfa9a64cfb3dd01fa1ee1150d589481e54e28e [PATCH] move rtc_interrupt() prototype to rtc.h broke strace(1) builds. The below moves the kernel-only additions lower, under the already provided #ifdef __KERNEL__ statement. Cc: <stable@kernel.org> Signed-off-by:
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Alasdair G Kergon authored
The code that handles bios that span table target boundaries by breaking them up into smaller bios will not split an individual struct bio_vec into more than two pieces. Sometimes more than that are required. This patch adds a loop to break the second piece up into as many pieces as are necessary. Cc: "Abhishek Gupta" <abhishekgupt@gmail.com> Cc: Dan Smith <danms@us.ibm.com> Signed-off-by:
Alasdair G Kergon <agk@redhat.com> Cc: <stable@kernel.org> Signed-off-by:
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Eric W. Biederman authored
A bare bones trivial patch to ensure we always get -EINVAL on the unsupported cases for sys_unshare. If this goes in before 2.6.16 it allows us to forward compatible with future applications using sys_unshare. Signed-off-by:
Eric W. Biederman <ebiederm@xmission.com> Cc: JANAK DESAI <janak@us.ibm.com> Cc: <stable@kerenl.org> Signed-off-by:
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