linux-ext4 - Re: [PATCH 4/4 v2] ext4: Speed up FITRIM by recording flags in ext4_group

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Date:	Thu, 10 Feb 2011 13:50:14 -0800
From:	Andreas Dilger <adilger@...ger.ca>
To:	Tao Ma <tm@....ma>
Cc:	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	Lukas Czerner <lczerner@...hat.com>
Subject: Re: [PATCH 4/4 v2] ext4: Speed up FITRIM by recording flags in ext4_group_info.

On 2011-02-09, at 23:33, Tao Ma <tm@....ma> wrote:
> After I delete some big image files and re-run the trim,
> it is still much faster than iterating the whole disk.
> /dev/sdb2             108G   25G   78G  24% /mnt/ext4
> 
> [root@...u-tm test]# time ./ftrim /mnt/ext4/a
> real    0m0.513s
> user    0m0.000s
> sys    0m0.069s

Excellent results. 

> +#define EXT4_GROUP_INFO_NEED_INIT_BIT        0
> +#define EXT4_GROUP_INFO_WAS_TRIMMED_BIT        1
> 
> #define EXT4_MB_GRP_NEED_INIT(grp)    \
>    (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
> +#define EXT4_MB_GRP_HAS_BEEN_TRIMMED(grp)    \

For consistency, it would be better to call this:

EXT4_MB_GRP_WAS_TRIMMED(grp)

And also add and use:

EXT4_MB_GRP_SET_TRIMMED(grp)

And 

EXT4_MB_GRP_CLEAR_TRIMMED(grp)

> 

In the code. Then you can add Reviewed-by: on this patch. 

Cheers, Andreas
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