* [PATCH] mm: accurately document nr_free_*_pages functions with code comments
@ 2013-02-06 8:25 Zhang Yanfei
2013-02-07 0:55 ` Randy Dunlap
0 siblings, 1 reply; 5+ messages in thread
From: Zhang Yanfei @ 2013-02-06 8:25 UTC (permalink / raw)
To: Andrew Morton, mgorman, minchan, kamezawa.hiroyu; +Cc: Linux MM, linux-kernel
Functions nr_free_zone_pages, nr_free_buffer_pages and nr_free_pagecache_pages
are horribly badly named, so accurately document them with code comments
in case of the misuse of them.
Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
---
mm/page_alloc.c | 23 +++++++++++++++++++----
1 files changed, 19 insertions(+), 4 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index df2022f..0790716 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2785,6 +2785,15 @@ void free_pages_exact(void *virt, size_t size)
}
EXPORT_SYMBOL(free_pages_exact);
+/**
+ * nr_free_zone_pages - get pages that is beyond high watermark
+ * @offset - The zone index of the highest zone
+ *
+ * The function counts pages which are beyond high watermark within
+ * all zones at or below a given zone index. For each zone, the
+ * amount of pages is calculated as:
+ * present_pages - high_pages
+ */
static unsigned int nr_free_zone_pages(int offset)
{
struct zoneref *z;
@@ -2805,8 +2814,11 @@ static unsigned int nr_free_zone_pages(int offset)
return sum;
}
-/*
- * Amount of free RAM allocatable within ZONE_DMA and ZONE_NORMAL
+/**
+ * nr_free_buffer_pages - get pages that is beyond high watermark
+ *
+ * The function counts pages which are beyond high watermark within
+ * ZONE_DMA and ZONE_NORMAL.
*/
unsigned int nr_free_buffer_pages(void)
{
@@ -2814,8 +2826,11 @@ unsigned int nr_free_buffer_pages(void)
}
EXPORT_SYMBOL_GPL(nr_free_buffer_pages);
-/*
- * Amount of free RAM allocatable within all zones
+/**
+ * nr_free_pagecache_pages - get pages that is beyond high watermark
+ *
+ * The function counts pages which are beyond high watermark within
+ * all zones.
*/
unsigned int nr_free_pagecache_pages(void)
{
--
1.7.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH] mm: accurately document nr_free_*_pages functions with code comments
2013-02-06 8:25 [PATCH] mm: accurately document nr_free_*_pages functions with code comments Zhang Yanfei
@ 2013-02-07 0:55 ` Randy Dunlap
2013-02-07 1:53 ` Zhang Yanfei
2013-02-07 1:57 ` [PATCH RESEND] " Zhang Yanfei
0 siblings, 2 replies; 5+ messages in thread
From: Randy Dunlap @ 2013-02-07 0:55 UTC (permalink / raw)
To: Zhang Yanfei
Cc: Andrew Morton, mgorman, minchan, kamezawa.hiroyu, Linux MM, linux-kernel
On 02/06/13 00:25, Zhang Yanfei wrote:
> Functions nr_free_zone_pages, nr_free_buffer_pages and nr_free_pagecache_pages
> are horribly badly named, so accurately document them with code comments
> in case of the misuse of them.
>
> Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
> ---
> mm/page_alloc.c | 23 +++++++++++++++++++----
> 1 files changed, 19 insertions(+), 4 deletions(-)
>
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index df2022f..0790716 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -2785,6 +2785,15 @@ void free_pages_exact(void *virt, size_t size)
> }
> EXPORT_SYMBOL(free_pages_exact);
>
> +/**
> + * nr_free_zone_pages - get pages that is beyond high watermark
> + * @offset - The zone index of the highest zone
Function parameter format uses a ':', not a '-'. E.g.,
* @offset: the zone index of the highest zone
> + *
> + * The function counts pages which are beyond high watermark within
> + * all zones at or below a given zone index. For each zone, the
> + * amount of pages is calculated as:
> + * present_pages - high_pages
> + */
> static unsigned int nr_free_zone_pages(int offset)
> {
> struct zoneref *z;
> @@ -2805,8 +2814,11 @@ static unsigned int nr_free_zone_pages(int offset)
> return sum;
> }
>
> -/*
> - * Amount of free RAM allocatable within ZONE_DMA and ZONE_NORMAL
> +/**
> + * nr_free_buffer_pages - get pages that is beyond high watermark
> + *
> + * The function counts pages which are beyond high watermark within
> + * ZONE_DMA and ZONE_NORMAL.
> */
> unsigned int nr_free_buffer_pages(void)
> {
> @@ -2814,8 +2826,11 @@ unsigned int nr_free_buffer_pages(void)
> }
> EXPORT_SYMBOL_GPL(nr_free_buffer_pages);
>
> -/*
> - * Amount of free RAM allocatable within all zones
> +/**
> + * nr_free_pagecache_pages - get pages that is beyond high watermark
> + *
> + * The function counts pages which are beyond high watermark within
> + * all zones.
> */
> unsigned int nr_free_pagecache_pages(void)
> {
>
--
~Randy
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] mm: accurately document nr_free_*_pages functions with code comments
2013-02-07 0:55 ` Randy Dunlap
@ 2013-02-07 1:53 ` Zhang Yanfei
2013-02-07 1:57 ` [PATCH RESEND] " Zhang Yanfei
1 sibling, 0 replies; 5+ messages in thread
From: Zhang Yanfei @ 2013-02-07 1:53 UTC (permalink / raw)
To: Randy Dunlap
Cc: Andrew Morton, mgorman, minchan, kamezawa.hiroyu, Linux MM, linux-kernel
于 2013年02月07日 08:55, Randy Dunlap 写道:
> On 02/06/13 00:25, Zhang Yanfei wrote:
>> Functions nr_free_zone_pages, nr_free_buffer_pages and nr_free_pagecache_pages
>> are horribly badly named, so accurately document them with code comments
>> in case of the misuse of them.
>>
>> Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
>> ---
>> mm/page_alloc.c | 23 +++++++++++++++++++----
>> 1 files changed, 19 insertions(+), 4 deletions(-)
>>
>> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
>> index df2022f..0790716 100644
>> --- a/mm/page_alloc.c
>> +++ b/mm/page_alloc.c
>> @@ -2785,6 +2785,15 @@ void free_pages_exact(void *virt, size_t size)
>> }
>> EXPORT_SYMBOL(free_pages_exact);
>>
>> +/**
>> + * nr_free_zone_pages - get pages that is beyond high watermark
>> + * @offset - The zone index of the highest zone
>
> Function parameter format uses a ':', not a '-'. E.g.,
>
> * @offset: the zone index of the highest zone
Sorry for my mistake. Thanks for your review.
>
>
>> + *
>> + * The function counts pages which are beyond high watermark within
>> + * all zones at or below a given zone index. For each zone, the
>> + * amount of pages is calculated as:
>> + * present_pages - high_pages
>> + */
>> static unsigned int nr_free_zone_pages(int offset)
>> {
>> struct zoneref *z;
>> @@ -2805,8 +2814,11 @@ static unsigned int nr_free_zone_pages(int offset)
>> return sum;
>> }
>>
>> -/*
>> - * Amount of free RAM allocatable within ZONE_DMA and ZONE_NORMAL
>> +/**
>> + * nr_free_buffer_pages - get pages that is beyond high watermark
>> + *
>> + * The function counts pages which are beyond high watermark within
>> + * ZONE_DMA and ZONE_NORMAL.
>> */
>> unsigned int nr_free_buffer_pages(void)
>> {
>> @@ -2814,8 +2826,11 @@ unsigned int nr_free_buffer_pages(void)
>> }
>> EXPORT_SYMBOL_GPL(nr_free_buffer_pages);
>>
>> -/*
>> - * Amount of free RAM allocatable within all zones
>> +/**
>> + * nr_free_pagecache_pages - get pages that is beyond high watermark
>> + *
>> + * The function counts pages which are beyond high watermark within
>> + * all zones.
>> */
>> unsigned int nr_free_pagecache_pages(void)
>> {
>>
>
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH RESEND] mm: accurately document nr_free_*_pages functions with code comments
2013-02-07 0:55 ` Randy Dunlap
2013-02-07 1:53 ` Zhang Yanfei
@ 2013-02-07 1:57 ` Zhang Yanfei
2013-02-07 23:26 ` Andrew Morton
1 sibling, 1 reply; 5+ messages in thread
From: Zhang Yanfei @ 2013-02-07 1:57 UTC (permalink / raw)
To: Randy Dunlap
Cc: Andrew Morton, mgorman, minchan, kamezawa.hiroyu, Linux MM, linux-kernel
Functions nr_free_zone_pages, nr_free_buffer_pages and nr_free_pagecache_pages
are horribly badly named, so accurately document them with code comments
in case of the misuse of them.
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
---
mm/page_alloc.c | 23 +++++++++++++++++++----
1 files changed, 19 insertions(+), 4 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index df2022f..0790716 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2785,6 +2785,15 @@ void free_pages_exact(void *virt, size_t size)
}
EXPORT_SYMBOL(free_pages_exact);
+/**
+ * nr_free_zone_pages - get pages that is beyond high watermark
+ * @offset: The zone index of the highest zone
+ *
+ * The function counts pages which are beyond high watermark within
+ * all zones at or below a given zone index. For each zone, the
+ * amount of pages is calculated as:
+ * present_pages - high_pages
+ */
static unsigned int nr_free_zone_pages(int offset)
{
struct zoneref *z;
@@ -2805,8 +2814,11 @@ static unsigned int nr_free_zone_pages(int offset)
return sum;
}
-/*
- * Amount of free RAM allocatable within ZONE_DMA and ZONE_NORMAL
+/**
+ * nr_free_buffer_pages - get pages that is beyond high watermark
+ *
+ * The function counts pages which are beyond high watermark within
+ * ZONE_DMA and ZONE_NORMAL.
*/
unsigned int nr_free_buffer_pages(void)
{
@@ -2814,8 +2826,11 @@ unsigned int nr_free_buffer_pages(void)
}
EXPORT_SYMBOL_GPL(nr_free_buffer_pages);
-/*
- * Amount of free RAM allocatable within all zones
+/**
+ * nr_free_pagecache_pages - get pages that is beyond high watermark
+ *
+ * The function counts pages which are beyond high watermark within
+ * all zones.
*/
unsigned int nr_free_pagecache_pages(void)
{
--
1.7.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH RESEND] mm: accurately document nr_free_*_pages functions with code comments
2013-02-07 1:57 ` [PATCH RESEND] " Zhang Yanfei
@ 2013-02-07 23:26 ` Andrew Morton
0 siblings, 0 replies; 5+ messages in thread
From: Andrew Morton @ 2013-02-07 23:26 UTC (permalink / raw)
To: Zhang Yanfei
Cc: Randy Dunlap, mgorman, minchan, kamezawa.hiroyu, Linux MM, linux-kernel
On Thu, 07 Feb 2013 09:57:27 +0800
Zhang Yanfei <zhangyanfei@cn.fujitsu.com> wrote:
> Functions nr_free_zone_pages, nr_free_buffer_pages and nr_free_pagecache_pages
> are horribly badly named, so accurately document them with code comments
> in case of the misuse of them.
Looks OK. I fiddled with it a bit:
--- a/mm/page_alloc.c~mm-accurately-document-nr_free__pages-functions-with-code-comments-fix
+++ a/mm/page_alloc.c
@@ -2813,12 +2813,12 @@ void free_pages_exact(void *virt, size_t
EXPORT_SYMBOL(free_pages_exact);
/**
- * nr_free_zone_pages - get pages that is beyond high watermark
+ * nr_free_zone_pages - count number of pages beyond high watermark
* @offset: The zone index of the highest zone
*
- * The function counts pages which are beyond high watermark within
- * all zones at or below a given zone index. For each zone, the
- * amount of pages is calculated as:
+ * nr_free_zone_pages() counts the number of counts pages which are beyond the
+ * high watermark within all zones at or below a given zone index. For each
+ * zone, the number of pages is calculated as:
* present_pages - high_pages
*/
static unsigned long nr_free_zone_pages(int offset)
@@ -2842,10 +2842,10 @@ static unsigned long nr_free_zone_pages(
}
/**
- * nr_free_buffer_pages - get pages that is beyond high watermark
+ * nr_free_buffer_pages - count number of pages beyond high watermark
*
- * The function counts pages which are beyond high watermark within
- * ZONE_DMA and ZONE_NORMAL.
+ * nr_free_buffer_pages() counts the number of pages which are beyond the high
+ * watermark within ZONE_DMA and ZONE_NORMAL.
*/
unsigned long nr_free_buffer_pages(void)
{
@@ -2854,10 +2854,10 @@ unsigned long nr_free_buffer_pages(void)
EXPORT_SYMBOL_GPL(nr_free_buffer_pages);
/**
- * nr_free_pagecache_pages - get pages that is beyond high watermark
+ * nr_free_pagecache_pages - count number of pages beyond high watermark
*
- * The function counts pages which are beyond high watermark within
- * all zones.
+ * nr_free_pagecache_pages() counts the number of pages which are beyond the
+ * high watermark within all zones.
*/
unsigned long nr_free_pagecache_pages(void)
{
_
^ permalink raw reply [flat|nested] 5+ messages in thread
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2013-02-06 8:25 [PATCH] mm: accurately document nr_free_*_pages functions with code comments Zhang Yanfei
2013-02-07 0:55 ` Randy Dunlap
2013-02-07 1:53 ` Zhang Yanfei
2013-02-07 1:57 ` [PATCH RESEND] " Zhang Yanfei
2013-02-07 23:26 ` Andrew Morton
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