[PATCH] mm/page-writeback.c: fix comments error in page-writeback.c

[PATCH] mm/page-writeback.c: fix comments error in page-writeback.c

[Wanpeng Li]

From: Wanpeng Li <liwp@linux.vnet.ibm.com>

Signed-off-by: Wanpeng Li <liwp@linux.vnet.ibm.com>
---
 mm/page-writeback.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 93d8d2f..c833bf0 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -930,7 +930,7 @@ static void bdi_update_dirty_ratelimit(struct backing_dev_info *bdi,
 	 */
 
 	/*
-	 * dirty_ratelimit will follow balanced_dirty_ratelimit iff
+	 * dirty_ratelimit will follow balanced_dirty_ratelimit if
 	 * task_ratelimit is on the same side of dirty_ratelimit, too.
 	 * For example, when
 	 * - dirty_ratelimit > balanced_dirty_ratelimit
@@ -941,7 +941,7 @@ static void bdi_update_dirty_ratelimit(struct backing_dev_info *bdi,
 	 * feel and care are stable dirty rate and small position error.
 	 *
 	 * |task_ratelimit - dirty_ratelimit| is used to limit the step size
-	 * and filter out the sigular points of balanced_dirty_ratelimit. Which
+	 * and filter out the singular points of balanced_dirty_ratelimit. Which
 	 * keeps jumping around randomly and can even leap far away at times
 	 * due to the small 200ms estimation period of dirty_rate (we want to
 	 * keep that period small to reduce time lags).
-- 
1.7.9.5

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Re: [PATCH] mm/page-writeback.c: fix comments error in page-writeback.c

[Fengguang Wu]

On Sat, Jun 09, 2012 at 07:45:33PM +0800, Wanpeng Li wrote:
> From: Wanpeng Li <liwp@linux.vnet.ibm.com>
> 
> Signed-off-by: Wanpeng Li <liwp@linux.vnet.ibm.com>
> ---
>  mm/page-writeback.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/page-writeback.c b/mm/page-writeback.c
> index 93d8d2f..c833bf0 100644
> --- a/mm/page-writeback.c
> +++ b/mm/page-writeback.c
> @@ -930,7 +930,7 @@ static void bdi_update_dirty_ratelimit(struct backing_dev_info *bdi,
>  	 */
>  
>  	/*
> -	 * dirty_ratelimit will follow balanced_dirty_ratelimit iff
> +	 * dirty_ratelimit will follow balanced_dirty_ratelimit if

That 'iff' means 'if and only if'.

>  	 * task_ratelimit is on the same side of dirty_ratelimit, too.
>  	 * For example, when
>  	 * - dirty_ratelimit > balanced_dirty_ratelimit
> @@ -941,7 +941,7 @@ static void bdi_update_dirty_ratelimit(struct backing_dev_info *bdi,
>  	 * feel and care are stable dirty rate and small position error.
>  	 *
>  	 * |task_ratelimit - dirty_ratelimit| is used to limit the step size
> -	 * and filter out the sigular points of balanced_dirty_ratelimit. Which
> +	 * and filter out the singular points of balanced_dirty_ratelimit. Which
>  	 * keeps jumping around randomly and can even leap far away at times
>  	 * due to the small 200ms estimation period of dirty_rate (we want to
>  	 * keep that period small to reduce time lags).

I'll fold the above chunk into the previous patch.

Thanks,
Fengguang

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