* [PATCH 2/2] mm, vmalloc: use well-defined find_last_bit() func
2013-08-02 1:57 [PATCH 1/2] mm, vmalloc: remove useless variable in vmap_block Joonsoo Kim
@ 2013-08-02 1:57 ` Joonsoo Kim
2013-08-02 8:28 ` Wanpeng Li
` (3 more replies)
2013-08-02 8:14 ` [PATCH 1/2] mm, vmalloc: remove useless variable in vmap_block Wanpeng Li
` (3 subsequent siblings)
4 siblings, 4 replies; 11+ messages in thread
From: Joonsoo Kim @ 2013-08-02 1:57 UTC (permalink / raw)
To: Andrew Morton
Cc: linux-mm, linux-kernel, Zhang Yanfei, Joonsoo Kim,
Johannes Weiner, Joonsoo Kim
Our intention in here is to find last_bit within the region to flush.
There is well-defined function, find_last_bit() for this purpose and
it's performance may be slightly better than current implementation.
So change it.
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index d23c432..93d3182 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1016,15 +1016,16 @@ void vm_unmap_aliases(void)
rcu_read_lock();
list_for_each_entry_rcu(vb, &vbq->free, free_list) {
- int i;
+ int i, j;
spin_lock(&vb->lock);
i = find_first_bit(vb->dirty_map, VMAP_BBMAP_BITS);
- while (i < VMAP_BBMAP_BITS) {
+ if (i < VMAP_BBMAP_BITS) {
unsigned long s, e;
- int j;
- j = find_next_zero_bit(vb->dirty_map,
- VMAP_BBMAP_BITS, i);
+
+ j = find_last_bit(vb->dirty_map,
+ VMAP_BBMAP_BITS);
+ j = j + 1; /* need exclusive index */
s = vb->va->va_start + (i << PAGE_SHIFT);
e = vb->va->va_start + (j << PAGE_SHIFT);
@@ -1034,10 +1035,6 @@ void vm_unmap_aliases(void)
start = s;
if (e > end)
end = e;
-
- i = j;
- i = find_next_bit(vb->dirty_map,
- VMAP_BBMAP_BITS, i);
}
spin_unlock(&vb->lock);
}
--
1.7.9.5
--
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^ permalink raw reply related [flat|nested] 11+ messages in thread* Re: [PATCH 2/2] mm, vmalloc: use well-defined find_last_bit() func
2013-08-02 1:57 ` [PATCH 2/2] mm, vmalloc: use well-defined find_last_bit() func Joonsoo Kim
@ 2013-08-02 8:28 ` Wanpeng Li
2013-08-02 8:28 ` Wanpeng Li
` (2 subsequent siblings)
3 siblings, 0 replies; 11+ messages in thread
From: Wanpeng Li @ 2013-08-02 8:28 UTC (permalink / raw)
To: Joonsoo Kim
Cc: Andrew Morton, linux-mm, linux-kernel, Zhang Yanfei, Joonsoo Kim,
Johannes Weiner
On Fri, Aug 02, 2013 at 10:57:01AM +0900, Joonsoo Kim wrote:
>Our intention in here is to find last_bit within the region to flush.
>There is well-defined function, find_last_bit() for this purpose and
>it's performance may be slightly better than current implementation.
>So change it.
>
>Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Reviewed-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
>
>diff --git a/mm/vmalloc.c b/mm/vmalloc.c
>index d23c432..93d3182 100644
>--- a/mm/vmalloc.c
>+++ b/mm/vmalloc.c
>@@ -1016,15 +1016,16 @@ void vm_unmap_aliases(void)
>
> rcu_read_lock();
> list_for_each_entry_rcu(vb, &vbq->free, free_list) {
>- int i;
>+ int i, j;
>
> spin_lock(&vb->lock);
> i = find_first_bit(vb->dirty_map, VMAP_BBMAP_BITS);
>- while (i < VMAP_BBMAP_BITS) {
>+ if (i < VMAP_BBMAP_BITS) {
> unsigned long s, e;
>- int j;
>- j = find_next_zero_bit(vb->dirty_map,
>- VMAP_BBMAP_BITS, i);
>+
>+ j = find_last_bit(vb->dirty_map,
>+ VMAP_BBMAP_BITS);
>+ j = j + 1; /* need exclusive index */
>
> s = vb->va->va_start + (i << PAGE_SHIFT);
> e = vb->va->va_start + (j << PAGE_SHIFT);
>@@ -1034,10 +1035,6 @@ void vm_unmap_aliases(void)
> start = s;
> if (e > end)
> end = e;
>-
>- i = j;
>- i = find_next_bit(vb->dirty_map,
>- VMAP_BBMAP_BITS, i);
> }
> spin_unlock(&vb->lock);
> }
>--
>1.7.9.5
>
>--
>To unsubscribe, send a message with 'unsubscribe linux-mm' in
>the body to majordomo@kvack.org. For more info on Linux MM,
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^ permalink raw reply [flat|nested] 11+ messages in thread* Re: [PATCH 2/2] mm, vmalloc: use well-defined find_last_bit() func
2013-08-02 1:57 ` [PATCH 2/2] mm, vmalloc: use well-defined find_last_bit() func Joonsoo Kim
2013-08-02 8:28 ` Wanpeng Li
@ 2013-08-02 8:28 ` Wanpeng Li
2013-08-02 19:22 ` Johannes Weiner
2013-08-03 0:46 ` Yanfei Zhang
3 siblings, 0 replies; 11+ messages in thread
From: Wanpeng Li @ 2013-08-02 8:28 UTC (permalink / raw)
Cc: Andrew Morton, linux-mm, linux-kernel, Zhang Yanfei, Joonsoo Kim,
Johannes Weiner, Joonsoo Kim
On Fri, Aug 02, 2013 at 10:57:01AM +0900, Joonsoo Kim wrote:
>Our intention in here is to find last_bit within the region to flush.
>There is well-defined function, find_last_bit() for this purpose and
>it's performance may be slightly better than current implementation.
>So change it.
>
>Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Reviewed-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
>
>diff --git a/mm/vmalloc.c b/mm/vmalloc.c
>index d23c432..93d3182 100644
>--- a/mm/vmalloc.c
>+++ b/mm/vmalloc.c
>@@ -1016,15 +1016,16 @@ void vm_unmap_aliases(void)
>
> rcu_read_lock();
> list_for_each_entry_rcu(vb, &vbq->free, free_list) {
>- int i;
>+ int i, j;
>
> spin_lock(&vb->lock);
> i = find_first_bit(vb->dirty_map, VMAP_BBMAP_BITS);
>- while (i < VMAP_BBMAP_BITS) {
>+ if (i < VMAP_BBMAP_BITS) {
> unsigned long s, e;
>- int j;
>- j = find_next_zero_bit(vb->dirty_map,
>- VMAP_BBMAP_BITS, i);
>+
>+ j = find_last_bit(vb->dirty_map,
>+ VMAP_BBMAP_BITS);
>+ j = j + 1; /* need exclusive index */
>
> s = vb->va->va_start + (i << PAGE_SHIFT);
> e = vb->va->va_start + (j << PAGE_SHIFT);
>@@ -1034,10 +1035,6 @@ void vm_unmap_aliases(void)
> start = s;
> if (e > end)
> end = e;
>-
>- i = j;
>- i = find_next_bit(vb->dirty_map,
>- VMAP_BBMAP_BITS, i);
> }
> spin_unlock(&vb->lock);
> }
>--
>1.7.9.5
>
>--
>To unsubscribe, send a message with 'unsubscribe linux-mm' in
>the body to majordomo@kvack.org. For more info on Linux MM,
>see: http://www.linux-mm.org/ .
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^ permalink raw reply [flat|nested] 11+ messages in thread* Re: [PATCH 2/2] mm, vmalloc: use well-defined find_last_bit() func
2013-08-02 1:57 ` [PATCH 2/2] mm, vmalloc: use well-defined find_last_bit() func Joonsoo Kim
2013-08-02 8:28 ` Wanpeng Li
2013-08-02 8:28 ` Wanpeng Li
@ 2013-08-02 19:22 ` Johannes Weiner
2013-08-03 0:46 ` Yanfei Zhang
3 siblings, 0 replies; 11+ messages in thread
From: Johannes Weiner @ 2013-08-02 19:22 UTC (permalink / raw)
To: Joonsoo Kim
Cc: Andrew Morton, linux-mm, linux-kernel, Zhang Yanfei, Joonsoo Kim
On Fri, Aug 02, 2013 at 10:57:01AM +0900, Joonsoo Kim wrote:
> Our intention in here is to find last_bit within the region to flush.
> There is well-defined function, find_last_bit() for this purpose and
> it's performance may be slightly better than current implementation.
> So change it.
>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
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Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 2/2] mm, vmalloc: use well-defined find_last_bit() func
2013-08-02 1:57 ` [PATCH 2/2] mm, vmalloc: use well-defined find_last_bit() func Joonsoo Kim
` (2 preceding siblings ...)
2013-08-02 19:22 ` Johannes Weiner
@ 2013-08-03 0:46 ` Yanfei Zhang
3 siblings, 0 replies; 11+ messages in thread
From: Yanfei Zhang @ 2013-08-03 0:46 UTC (permalink / raw)
To: Joonsoo Kim
Cc: Andrew Morton, linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Zhang Yanfei, Joonsoo Kim, Johannes Weiner
[-- Attachment #1: Type: text/plain, Size: 2461 bytes --]
On Friday, August 2, 2013, Joonsoo Kim wrote:
> Our intention in here is to find last_bit within the region to flush.
> There is well-defined function, find_last_bit() for this purpose and
> it's performance may be slightly better than current implementation.
> So change it.
>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com <javascript:;>>
Looks reasonable.
Acked-by: Zhang Yanfei
<zhangyanfei@cn.fujitsu.com<https://mail.google.com/mail/mu/mp/219/?source=nap&hr=1&hl=en>
>
>
> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> index d23c432..93d3182 100644
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -1016,15 +1016,16 @@ void vm_unmap_aliases(void)
>
> rcu_read_lock();
> list_for_each_entry_rcu(vb, &vbq->free, free_list) {
> - int i;
> + int i, j;
>
> spin_lock(&vb->lock);
> i = find_first_bit(vb->dirty_map, VMAP_BBMAP_BITS);
> - while (i < VMAP_BBMAP_BITS) {
> + if (i < VMAP_BBMAP_BITS) {
> unsigned long s, e;
> - int j;
> - j = find_next_zero_bit(vb->dirty_map,
> - VMAP_BBMAP_BITS, i);
> +
> + j = find_last_bit(vb->dirty_map,
> + VMAP_BBMAP_BITS);
> + j = j + 1; /* need exclusive index */
>
> s = vb->va->va_start + (i << PAGE_SHIFT);
> e = vb->va->va_start + (j << PAGE_SHIFT);
> @@ -1034,10 +1035,6 @@ void vm_unmap_aliases(void)
> start = s;
> if (e > end)
> end = e;
> -
> - i = j;
> - i = find_next_bit(vb->dirty_map,
> - VMAP_BBMAP_BITS,
> i);
> }
> spin_unlock(&vb->lock);
> }
> --
> 1.7.9.5
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org <javascript:;>
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
>
[-- Attachment #2: Type: text/html, Size: 3825 bytes --]
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 1/2] mm, vmalloc: remove useless variable in vmap_block
2013-08-02 1:57 [PATCH 1/2] mm, vmalloc: remove useless variable in vmap_block Joonsoo Kim
2013-08-02 1:57 ` [PATCH 2/2] mm, vmalloc: use well-defined find_last_bit() func Joonsoo Kim
@ 2013-08-02 8:14 ` Wanpeng Li
2013-08-02 8:14 ` Wanpeng Li
` (2 subsequent siblings)
4 siblings, 0 replies; 11+ messages in thread
From: Wanpeng Li @ 2013-08-02 8:14 UTC (permalink / raw)
To: Joonsoo Kim
Cc: Andrew Morton, linux-mm, linux-kernel, Zhang Yanfei, Joonsoo Kim,
Johannes Weiner
On Fri, Aug 02, 2013 at 10:57:00AM +0900, Joonsoo Kim wrote:
>vbq in vmap_block isn't used. So remove it.
>
>Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
>
Reviewed-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
>diff --git a/mm/vmalloc.c b/mm/vmalloc.c
>index 13a5495..d23c432 100644
>--- a/mm/vmalloc.c
>+++ b/mm/vmalloc.c
>@@ -752,7 +752,6 @@ struct vmap_block_queue {
> struct vmap_block {
> spinlock_t lock;
> struct vmap_area *va;
>- struct vmap_block_queue *vbq;
> unsigned long free, dirty;
> DECLARE_BITMAP(dirty_map, VMAP_BBMAP_BITS);
> struct list_head free_list;
>@@ -830,7 +829,6 @@ static struct vmap_block *new_vmap_block(gfp_t gfp_mask)
> radix_tree_preload_end();
>
> vbq = &get_cpu_var(vmap_block_queue);
>- vb->vbq = vbq;
> spin_lock(&vbq->lock);
> list_add_rcu(&vb->free_list, &vbq->free);
> spin_unlock(&vbq->lock);
>--
>1.7.9.5
>
>--
>To unsubscribe, send a message with 'unsubscribe linux-mm' in
>the body to majordomo@kvack.org. For more info on Linux MM,
>see: http://www.linux-mm.org/ .
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^ permalink raw reply [flat|nested] 11+ messages in thread* Re: [PATCH 1/2] mm, vmalloc: remove useless variable in vmap_block
2013-08-02 1:57 [PATCH 1/2] mm, vmalloc: remove useless variable in vmap_block Joonsoo Kim
2013-08-02 1:57 ` [PATCH 2/2] mm, vmalloc: use well-defined find_last_bit() func Joonsoo Kim
2013-08-02 8:14 ` [PATCH 1/2] mm, vmalloc: remove useless variable in vmap_block Wanpeng Li
@ 2013-08-02 8:14 ` Wanpeng Li
2013-08-02 19:15 ` Johannes Weiner
2013-08-03 0:38 ` Yanfei Zhang
4 siblings, 0 replies; 11+ messages in thread
From: Wanpeng Li @ 2013-08-02 8:14 UTC (permalink / raw)
Cc: Andrew Morton, linux-mm, linux-kernel, Zhang Yanfei, Joonsoo Kim,
Johannes Weiner, Joonsoo Kim
On Fri, Aug 02, 2013 at 10:57:00AM +0900, Joonsoo Kim wrote:
>vbq in vmap_block isn't used. So remove it.
>
>Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
>
Reviewed-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
>diff --git a/mm/vmalloc.c b/mm/vmalloc.c
>index 13a5495..d23c432 100644
>--- a/mm/vmalloc.c
>+++ b/mm/vmalloc.c
>@@ -752,7 +752,6 @@ struct vmap_block_queue {
> struct vmap_block {
> spinlock_t lock;
> struct vmap_area *va;
>- struct vmap_block_queue *vbq;
> unsigned long free, dirty;
> DECLARE_BITMAP(dirty_map, VMAP_BBMAP_BITS);
> struct list_head free_list;
>@@ -830,7 +829,6 @@ static struct vmap_block *new_vmap_block(gfp_t gfp_mask)
> radix_tree_preload_end();
>
> vbq = &get_cpu_var(vmap_block_queue);
>- vb->vbq = vbq;
> spin_lock(&vbq->lock);
> list_add_rcu(&vb->free_list, &vbq->free);
> spin_unlock(&vbq->lock);
>--
>1.7.9.5
>
>--
>To unsubscribe, send a message with 'unsubscribe linux-mm' in
>the body to majordomo@kvack.org. For more info on Linux MM,
>see: http://www.linux-mm.org/ .
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^ permalink raw reply [flat|nested] 11+ messages in thread* Re: [PATCH 1/2] mm, vmalloc: remove useless variable in vmap_block
2013-08-02 1:57 [PATCH 1/2] mm, vmalloc: remove useless variable in vmap_block Joonsoo Kim
` (2 preceding siblings ...)
2013-08-02 8:14 ` Wanpeng Li
@ 2013-08-02 19:15 ` Johannes Weiner
2013-08-03 0:38 ` Yanfei Zhang
4 siblings, 0 replies; 11+ messages in thread
From: Johannes Weiner @ 2013-08-02 19:15 UTC (permalink / raw)
To: Joonsoo Kim
Cc: Andrew Morton, linux-mm, linux-kernel, Zhang Yanfei, Joonsoo Kim
On Fri, Aug 02, 2013 at 10:57:00AM +0900, Joonsoo Kim wrote:
> vbq in vmap_block isn't used. So remove it.
>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
--
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^ permalink raw reply [flat|nested] 11+ messages in thread* Re: [PATCH 1/2] mm, vmalloc: remove useless variable in vmap_block
2013-08-02 1:57 [PATCH 1/2] mm, vmalloc: remove useless variable in vmap_block Joonsoo Kim
` (3 preceding siblings ...)
2013-08-02 19:15 ` Johannes Weiner
@ 2013-08-03 0:38 ` Yanfei Zhang
2013-08-03 0:44 ` Yanfei Zhang
4 siblings, 1 reply; 11+ messages in thread
From: Yanfei Zhang @ 2013-08-03 0:38 UTC (permalink / raw)
To: Joonsoo Kim
Cc: Andrew Morton, linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Zhang Yanfei, Joonsoo Kim, Johannes Weiner
[-- Attachment #1: Type: text/plain, Size: 1237 bytes --]
On Friday, August 2, 2013, Joonsoo Kim wrote:
> vbq in vmap_block isn't used. So remove it.
>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com <javascript:;>>
Acked-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.con>
> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> index 13a5495..d23c432 100644
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -752,7 +752,6 @@ struct vmap_block_queue {
> struct vmap_block {
> spinlock_t lock;
> struct vmap_area *va;
> - struct vmap_block_queue *vbq;
> unsigned long free, dirty;
> DECLARE_BITMAP(dirty_map, VMAP_BBMAP_BITS);
> struct list_head free_list;
> @@ -830,7 +829,6 @@ static struct vmap_block *new_vmap_block(gfp_t
> gfp_mask)
> radix_tree_preload_end();
>
> vbq = &get_cpu_var(vmap_block_queue);
> - vb->vbq = vbq;
> spin_lock(&vbq->lock);
> list_add_rcu(&vb->free_list, &vbq->free);
> spin_unlock(&vbq->lock);
> --
> 1.7.9.5
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org <javascript:;>
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
>
[-- Attachment #2: Type: text/html, Size: 2022 bytes --]
^ permalink raw reply [flat|nested] 11+ messages in thread* Re: [PATCH 1/2] mm, vmalloc: remove useless variable in vmap_block
2013-08-03 0:38 ` Yanfei Zhang
@ 2013-08-03 0:44 ` Yanfei Zhang
0 siblings, 0 replies; 11+ messages in thread
From: Yanfei Zhang @ 2013-08-03 0:44 UTC (permalink / raw)
To: Joonsoo Kim
Cc: Andrew Morton, linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Zhang Yanfei, Joonsoo Kim, Johannes Weiner
[-- Attachment #1: Type: text/plain, Size: 1411 bytes --]
On Saturday, August 3, 2013, Yanfei Zhang wrote:
> On Friday, August 2, 2013, Joonsoo Kim wrote:
>
>> vbq in vmap_block isn't used. So remove it.
>>
>> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
>
>
> Acked-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.con>
>
Sorry, the mail was wrongly written, it should be :
Acked-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
>
>
>> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
>> index 13a5495..d23c432 100644
>> --- a/mm/vmalloc.c
>> +++ b/mm/vmalloc.c
>> @@ -752,7 +752,6 @@ struct vmap_block_queue {
>> struct vmap_block {
>> spinlock_t lock;
>> struct vmap_area *va;
>> - struct vmap_block_queue *vbq;
>> unsigned long free, dirty;
>> DECLARE_BITMAP(dirty_map, VMAP_BBMAP_BITS);
>> struct list_head free_list;
>> @@ -830,7 +829,6 @@ static struct vmap_block *new_vmap_block(gfp_t
>> gfp_mask)
>> radix_tree_preload_end();
>>
>> vbq = &get_cpu_var(vmap_block_queue);
>> - vb->vbq = vbq;
>> spin_lock(&vbq->lock);
>> list_add_rcu(&vb->free_list, &vbq->free);
>> spin_unlock(&vbq->lock);
>> --
>> 1.7.9.5
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>> Please read the FAQ at http://www.tux.org/lkml/
>>
>
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^ permalink raw reply [flat|nested] 11+ messages in thread