[PATCH v3] slab: initialize unused alien cache entry as NULL at alloc_alien_cache().

[PATCH v3] slab: initialize unused alien cache entry as NULL at alloc_alien_cache().

[Haicheng Li]

Comparing with existing code, it's a simpler way to use kzalloc_node()
to ensure that each unused alien cache entry is NULL.

CC: Pekka Enberg <penberg@cs.helsinki.fi>
CC: Eric Dumazet <eric.dumazet@gmail.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Christoph Lameter <cl@linux-foundation.org>
Reviewed-by: Matt Mackall <mpm@selenic.com>
Signed-off-by: Haicheng Li <haicheng.li@linux.intel.com>
---
  mm/slab.c |    6 ++----
  1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/mm/slab.c b/mm/slab.c
index 7dfa481..5d1a782 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -971,13 +971,11 @@ static struct array_cache **alloc_alien_cache(int node, int limit, gfp_t gfp)

  	if (limit > 1)
  		limit = 12;
-	ac_ptr = kmalloc_node(memsize, gfp, node);
+	ac_ptr = kzalloc_node(memsize, gfp, node);
  	if (ac_ptr) {
  		for_each_node(i) {
-			if (i == node || !node_online(i)) {
-				ac_ptr[i] = NULL;
+			if (i == node || !node_online(i))
  				continue;
-			}
  			ac_ptr[i] = alloc_arraycache(node, limit, 0xbaadf00d, gfp);
  			if (!ac_ptr[i]) {
  				for (i--; i >= 0; i--)
-- 
1.5.3.8


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Re: [PATCH v3] slab: initialize unused alien cache entry as NULL at alloc_alien_cache().

[Pekka Enberg]

On Wed, Jan 6, 2010 at 9:25 AM, Haicheng Li <haicheng.li@linux.intel.com> wrote:
> Comparing with existing code, it's a simpler way to use kzalloc_node()
> to ensure that each unused alien cache entry is NULL.
>
> CC: Pekka Enberg <penberg@cs.helsinki.fi>
> CC: Eric Dumazet <eric.dumazet@gmail.com>
> Acked-by: Andi Kleen <ak@linux.intel.com>
> Acked-by: Christoph Lameter <cl@linux-foundation.org>
> Reviewed-by: Matt Mackall <mpm@selenic.com>
> Signed-off-by: Haicheng Li <haicheng.li@linux.intel.com>

I can find a trace of Andi acking the previous version of this patch
but I don't see an ACK from Christoph nor a revieved-by from Matt. Was
I not CC'd on those emails or what's going on here?

                        Pekka

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Re: [PATCH v3] slab: initialize unused alien cache entry as NULL at alloc_alien_cache().

[Haicheng Li]

Pekka Enberg wrote:
 > I can find a trace of Andi acking the previous version of this patch
 > but I don't see an ACK from Christoph nor a revieved-by from Matt. Was
 > I not CC'd on those emails or what's going on here?
 >

Pekka,

Christoph said he will ack this patch if remove the change of MAX_NUMNODES (see below),
so I add him directly as Acked-by in this revised patch. And also, I got review
comments from Matt for v1 and changed the patch accordingly.

Is it a violation of the rule? if so, I'm sorry, actually not quite clear with the rule.



Christoph Lameter wrote:
 > On Wed, 23 Dec 2009, Haicheng Li wrote:
 >
 >> @@ -966,18 +966,16 @@ static void *alternate_node_alloc(struct kmem_cache *,
 >> gfp_t);
 >>  static struct array_cache **alloc_alien_cache(int node, int limit, gfp_t gfp)
 >>  {
 >>  	struct array_cache **ac_ptr;
 >> -	int memsize = sizeof(void *) * nr_node_ids;
 >> +	int memsize = sizeof(void *) * MAX_NUMNODES;
 >>  	int i;
 >
 > Remove this change and I will ack the patch.
 >


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Re: [PATCH v3] slab: initialize unused alien cache entry as NULL at alloc_alien_cache().

[Pekka Enberg]

Hi,

Haicheng Li wrote:
> Pekka Enberg wrote:
>  > I can find a trace of Andi acking the previous version of this patch
>  > but I don't see an ACK from Christoph nor a revieved-by from Matt. Was
>  > I not CC'd on those emails or what's going on here?
>  >
> 
> Christoph said he will ack this patch if remove the change of 
> MAX_NUMNODES (see below),
> so I add him directly as Acked-by in this revised patch. And also, I got 
> review
> comments from Matt for v1 and changed the patch accordingly.
> 
> Is it a violation of the rule? if so, I'm sorry, actually not quite 
> clear with the rule.

See Section 14 of Documentation/SubmittingPatches. You should never add 
tags unless they came from the said person. The ACKs from Andi is fine, 
the one from Christoph is borderline but OK and the one from Matt is 
_not_ OK.

I can fix those up but I'll wait from an explicit ACK from Christoph first.

                         Pekka

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Re: [PATCH v3] slab: initialize unused alien cache entry as NULL at alloc_alien_cache().

[Haicheng Li]

understood. thanks!

Pekka Enberg wrote:
> Hi,
> 
> Haicheng Li wrote:
>> Pekka Enberg wrote:
>>  > I can find a trace of Andi acking the previous version of this patch
>>  > but I don't see an ACK from Christoph nor a revieved-by from Matt. Was
>>  > I not CC'd on those emails or what's going on here?
>>  >
>>
>> Christoph said he will ack this patch if remove the change of 
>> MAX_NUMNODES (see below),
>> so I add him directly as Acked-by in this revised patch. And also, I 
>> got review
>> comments from Matt for v1 and changed the patch accordingly.
>>
>> Is it a violation of the rule? if so, I'm sorry, actually not quite 
>> clear with the rule.
> 
> See Section 14 of Documentation/SubmittingPatches. You should never add 
> tags unless they came from the said person. The ACKs from Andi is fine, 
> the one from Christoph is borderline but OK and the one from Matt is 
> _not_ OK.
> 
> I can fix those up but I'll wait from an explicit ACK from Christoph first.
> 
>                         Pekka

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Re: [PATCH v3] slab: initialize unused alien cache entry as NULL at alloc_alien_cache().

[Christoph Lameter]

Explicit Ack..

Acked-by: Christoph Lameter <cl@linux-foundation.org>

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Re: [PATCH v3] slab: initialize unused alien cache entry as NULL at alloc_alien_cache().

[Pekka Enberg]

Haicheng Li kirjoitti:
> Comparing with existing code, it's a simpler way to use kzalloc_node()
> to ensure that each unused alien cache entry is NULL.
> 
> CC: Pekka Enberg <penberg@cs.helsinki.fi>
> CC: Eric Dumazet <eric.dumazet@gmail.com>
> ---
>  mm/slab.c |    6 ++----
>  1 files changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/mm/slab.c b/mm/slab.c
> index 7dfa481..5d1a782 100644
> --- a/mm/slab.c
> +++ b/mm/slab.c
> @@ -971,13 +971,11 @@ static struct array_cache **alloc_alien_cache(int 
> node, int limit, gfp_t gfp)
> 
>      if (limit > 1)
>          limit = 12;
> -    ac_ptr = kmalloc_node(memsize, gfp, node);
> +    ac_ptr = kzalloc_node(memsize, gfp, node);
>      if (ac_ptr) {
>          for_each_node(i) {
> -            if (i == node || !node_online(i)) {
> -                ac_ptr[i] = NULL;
> +            if (i == node || !node_online(i))
>                  continue;
> -            }
>              ac_ptr[i] = alloc_arraycache(node, limit, 0xbaadf00d, gfp);
>              if (!ac_ptr[i]) {
>                  for (i--; i >= 0; i--)

Christoph? Matt?

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Re: [PATCH v3] slab: initialize unused alien cache entry as NULL at alloc_alien_cache().

[Matt Mackall]

On Thu, 2010-01-07 at 14:11 +0200, Pekka Enberg wrote:
> Haicheng Li kirjoitti:
> > Comparing with existing code, it's a simpler way to use kzalloc_node()
> > to ensure that each unused alien cache entry is NULL.
> > 
> > CC: Pekka Enberg <penberg@cs.helsinki.fi>
> > CC: Eric Dumazet <eric.dumazet@gmail.com>
> > ---
> >  mm/slab.c |    6 ++----
> >  1 files changed, 2 insertions(+), 4 deletions(-)
> > 
> > diff --git a/mm/slab.c b/mm/slab.c
> > index 7dfa481..5d1a782 100644
> > --- a/mm/slab.c
> > +++ b/mm/slab.c
> > @@ -971,13 +971,11 @@ static struct array_cache **alloc_alien_cache(int 
> > node, int limit, gfp_t gfp)
> > 
> >      if (limit > 1)
> >          limit = 12;
> > -    ac_ptr = kmalloc_node(memsize, gfp, node);
> > +    ac_ptr = kzalloc_node(memsize, gfp, node);
> >      if (ac_ptr) {
> >          for_each_node(i) {
> > -            if (i == node || !node_online(i)) {
> > -                ac_ptr[i] = NULL;
> > +            if (i == node || !node_online(i))
> >                  continue;
> > -            }
> >              ac_ptr[i] = alloc_arraycache(node, limit, 0xbaadf00d, gfp);
> >              if (!ac_ptr[i]) {
> >                  for (i--; i >= 0; i--)
> 
> Christoph? Matt?

Looks like a fine cleanup.

Acked-by: Matt Mackall <mpm@selenic.com>

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