linux-kernel - Re: + zram-introduce-per-device-debug_stat-sysfs-node-update-2.patch added to -mm tree

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Date:	Thu, 19 May 2016 09:56:54 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:	akpm@...ux-foundation.org
Cc:	sergey.senozhatsky@...il.com, minchan@...nel.org,
	mm-commits@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: + zram-introduce-per-device-debug_stat-sysfs-node-update-2.patch
 added to -mm tree

On (05/18/16 14:54), akpm@...ux-foundation.org wrote:
> The patch titled
>      Subject: zram-introduce-per-device-debug_stat-sysfs-node-update-2
> has been added to the -mm tree.  Its filename is
>      zram-introduce-per-device-debug_stat-sysfs-node-update-2.patch
> 
> This patch should soon appear at
>     http://ozlabs.org/~akpm/mmots/broken-out/zram-introduce-per-device-debug_stat-sysfs-node-update-2.patch
> and later at
>     http://ozlabs.org/~akpm/mmotm/broken-out/zram-introduce-per-device-debug_stat-sysfs-node-update-2.patch

Hello Andrew,

please drop this one. sorry for inconvenience, it was confusing,
but the final patch here is

message-id: 20160513230834.GB26763@...x
lkml.kernel.org/r/20160513230834.GB26763@...x

(link http://marc.info/?l=linux-kernel&m=146318088829399)


	-ss


> Before you just go and hit "reply", please:
>    a) Consider who else should be cc'ed
>    b) Prefer to cc a suitable mailing list as well
>    c) Ideally: find the original patch on the mailing list and do a
>       reply-to-all to that, adding suitable additional cc's
> 
> *** Remember to use Documentation/SubmitChecklist when testing your code ***
> 
> The -mm tree is included into linux-next and is updated
> there every 3-4 working days
> 
> ------------------------------------------------------
> From: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
> Subject: zram-introduce-per-device-debug_stat-sysfs-node-update-2
> 
> Link: http://lkml.kernel.org/r/20160513130358.631-1-sergey.senozhatsky@gmail.com
> Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
> Acked-by: Minchan Kim <minchan@...nel.org>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> ---
> 
>  drivers/block/zram/zram_drv.c |    8 ++++----
>  drivers/block/zram/zram_drv.h |    2 +-
>  2 files changed, 5 insertions(+), 5 deletions(-)
> 
> diff -puN drivers/block/zram/zram_drv.c~zram-introduce-per-device-debug_stat-sysfs-node-update-2 drivers/block/zram/zram_drv.c
> --- a/drivers/block/zram/zram_drv.c~zram-introduce-per-device-debug_stat-sysfs-node-update-2
> +++ a/drivers/block/zram/zram_drv.c
> @@ -446,7 +446,7 @@ static ssize_t debug_stat_show(struct de
>  	ret = scnprintf(buf, PAGE_SIZE,
>  			"version: %d\n%8llu\n",
>  			version,
> -			(u64)atomic64_read(&zram->stats.writestall));
> +			(u64)atomic64_read(&zram->stats.num_recompress));
>  	up_read(&zram->init_lock);
>  
>  	return ret;
> @@ -737,12 +737,12 @@ compress_again:
>  		zcomp_strm_release(zram->comp, zstrm);
>  		zstrm = NULL;
>  
> -		atomic64_inc(&zram->stats.writestall);
> -
>  		handle = zs_malloc(meta->mem_pool, clen,
>  				GFP_NOIO | __GFP_HIGHMEM);
> -		if (handle)
> +		if (handle) {
> +			atomic64_inc(&zram->stats.num_recompress);
>  			goto compress_again;
> +		}
>  
>  		pr_err("Error allocating memory for compressed page: %u, size=%zu\n",
>  			index, clen);
> diff -puN drivers/block/zram/zram_drv.h~zram-introduce-per-device-debug_stat-sysfs-node-update-2 drivers/block/zram/zram_drv.h
> --- a/drivers/block/zram/zram_drv.h~zram-introduce-per-device-debug_stat-sysfs-node-update-2
> +++ a/drivers/block/zram/zram_drv.h
> @@ -85,7 +85,7 @@ struct zram_stats {
>  	atomic64_t zero_pages;		/* no. of zero filled pages */
>  	atomic64_t pages_stored;	/* no. of pages currently stored */
>  	atomic_long_t max_used_pages;	/* no. of maximum pages stored */
> -	atomic64_t writestall;		/* no. of write slow paths */
> +	atomic64_t num_recompress;	/* no. of compression slow paths */
>  };
>  
>  struct zram_meta {
> _
> 
> Patches currently in -mm which might be from sergey.senozhatsky@...il.com are
> 
> zsmalloc-require-gfp-in-zs_malloc.patch
> zsmalloc-require-gfp-in-zs_malloc-v2.patch
> zram-user-per-cpu-compression-streams.patch
> zram-user-per-cpu-compression-streams-fix.patch
> zram-remove-max_comp_streams-internals.patch
> zram-introduce-per-device-debug_stat-sysfs-node.patch
> zram-introduce-per-device-debug_stat-sysfs-node-update-2.patch
> 
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