linux.git/mm/allocpercpu.c, branch master

percpu: kill legacy percpu allocator

2009-10-02T04:29:29+00:00

With ia64 converted, there's no arch left which still uses legacy
percpu allocator.  Kill it.

Signed-off-by: Tejun Heo 
Delightedly-acked-by: Rusty Russell 
Cc: Ingo Molnar 
Cc: Christoph Lameter

percpu: use dynamic percpu allocator as the default percpu allocator

2009-06-24T06:13:35+00:00

This patch makes most !CONFIG_HAVE_SETUP_PER_CPU_AREA archs use
dynamic percpu allocator.  The first chunk is allocated using
embedding helper and 8k is reserved for modules.  This ensures that
the new allocator behaves almost identically to the original allocator
as long as static percpu variables are concerned, so it shouldn't
introduce much breakage.

s390 and alpha use custom SHIFT_PERCPU_PTR() to work around addressing
range limit the addressing model imposes.  Unfortunately, this breaks
if the address is specified using a variable, so for now, the two
archs aren't converted.

The following architectures are affected by this change.

* sh
* arm
* cris
* mips
* sparc(32)
* blackfin
* avr32
* parisc (broken, under investigation)
* m32r
* powerpc(32)

As this change makes the dynamic allocator the default one,
CONFIG_HAVE_DYNAMIC_PER_CPU_AREA is replaced with its invert -
CONFIG_HAVE_LEGACY_PER_CPU_AREA, which is added to yet-to-be converted
archs.  These archs implement their own setup_per_cpu_areas() and the
conversion is not trivial.

* powerpc(64)
* sparc(64)
* ia64
* alpha
* s390

Boot and batch alloc/free tests on x86_32 with debug code (x86_32
doesn't use default first chunk initialization).  Compile tested on
sparc(32), powerpc(32), arm and alpha.

Kyle McMartin reported that this change breaks parisc.  The problem is
still under investigation and he is okay with pushing this patch
forward and fixing parisc later.

[ Impact: use dynamic allocator for most archs w/o custom percpu setup ]

Signed-off-by: Tejun Heo 
Acked-by: Rusty Russell 
Acked-by: David S. Miller 
Acked-by: Benjamin Herrenschmidt 
Acked-by: Martin Schwidefsky 
Reviewed-by: Christoph Lameter 
Cc: Paul Mundt 
Cc: Russell King 
Cc: Mikael Starvik 
Cc: Ralf Baechle 
Cc: Bryan Wu 
Cc: Kyle McMartin 
Cc: Matthew Wilcox 
Cc: Grant Grundler 
Cc: Hirokazu Takata 
Cc: Richard Henderson 
Cc: Ivan Kokshaysky 
Cc: Heiko Carstens 
Cc: Ingo Molnar

percpu: __percpu_depopulate_mask can take a const mask

2009-04-06T20:44:15+00:00

This eliminates a compiler warning:

  mm/allocpercpu.c: In function 'free_percpu':
  mm/allocpercpu.c:146: warning: passing argument 2 of '__percpu_depopulate_mask' discards qualifiers from pointer target type

Signed-off-by: Stephen Rothwell 
Signed-off-by: Linus Torvalds

cpumask: use new cpumask_ functions in core code.

2009-03-30T11:35:16+00:00

Impact: cleanup

Time to clean up remaining laggards using the old cpu_ functions.

Signed-off-by: Rusty Russell 
Cc: Greg Kroah-Hartman 
Cc: Ingo Molnar 
Cc: Trond.Myklebust@netapp.com

percpu: fix spurious alignment WARN in legacy SMP percpu allocator

2009-03-11T05:36:54+00:00

Impact: remove spurious WARN on legacy SMP percpu allocator

Commit f2a8205c4ef1af917d175c36a4097ae5587791c8 incorrectly added too
tight WARN_ON_ONCE() on alignments for UP and legacy SMP percpu
allocator.  Commit e317603694bfd17b28a40de9d65e1a4ec12f816e fixed it
for UP but legacy SMP allocator was forgotten.  Fix it.

Signed-off-by: Tejun Heo 
Reported-by: Sachin P. Sant

percpu: kill percpu_alloc() and friends

2009-02-20T07:29:08+00:00

Impact: kill unused functions

percpu_alloc() and its friends never saw much action.  It was supposed
to replace the cpu-mask unaware __alloc_percpu() but it never happened
and in fact __percpu_alloc_mask() itself never really grew proper
up/down handling interface either (no exported interface for
populate/depopulate).

percpu allocation is about to go through major reimplementation and
there's no reason to carry this unused interface around.  Replace it
with __alloc_percpu() and free_percpu().

Signed-off-by: Tejun Heo

mm/allocpercpu.c: make 4 functions static

2008-07-26T19:00:12+00:00

This patch makes the following needlessly global functions static:
 - percpu_depopulate()
 - __percpu_depopulate_mask()
 - percpu_populate()
 - __percpu_populate_mask()

Signed-off-by: Adrian Bunk 
Acked-by: Christoph Lameter 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Merge commit 'v2.6.26-rc9' into cpus4096

2008-07-06T12:23:39+00:00

Christoph has moved

2008-07-04T17:40:04+00:00

Remove all clameter@sgi.com addresses from the kernel tree since they will
become invalid on June 27th.  Change my maintainer email address for the
slab allocators to cl@linux-foundation.org (which will be the new email
address for the future).

Signed-off-by: Christoph Lameter 
Signed-off-by: Christoph Lameter 
Cc: Pekka Enberg 
Cc: Stephen Rothwell 
Cc: Matt Mackall 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: use performance variant for_each_cpu_mask_nr

2008-05-23T16:35:12+00:00

Change references from for_each_cpu_mask to for_each_cpu_mask_nr
where appropriate

Reviewed-by: Paul Jackson 
Reviewed-by: Christoph Lameter 
Signed-off-by: Mike Travis 
Signed-off-by: Ingo Molnar 
Signed-off-by: Thomas Gleixner