linux-kernel - Re: [PATCH v3 1/7] block: extend stream count for in-kernel use

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Date:   Mon, 1 Apr 2019 16:02:55 +1100
From:   Dave Chinner <david@...morbit.com>
To:     Kanchan Joshi <joshi.k@...sung.com>
Cc:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org, axboe@...com, prakash.v@...sung.com,
        anshul@...sung.com, joshiiitr@...il.com
Subject: Re: [PATCH v3 1/7] block: extend stream count for in-kernel use

On Fri, Mar 29, 2019 at 01:23:46PM +0530, Kanchan Joshi wrote:
> This patch bumps up stream count to suppor in-kernel hints. It also
> adds 'streamid' member in 'request' and declares new API for driver
> to register stream-info with block layer.
> 
> Signed-off-by: Kanchan Joshi <joshi.k@...sung.com>
> ---
>  include/linux/blkdev.h | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index 338604d..4088e21 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -214,6 +214,7 @@ struct request {
>  #endif
>  
>  	unsigned short write_hint;
> +	unsigned short streamid;
>  	unsigned short ioprio;
>  
>  	void *special;		/* opaque pointer available for LLD use */
> @@ -341,6 +342,8 @@ struct queue_limits {
>  	unsigned char		misaligned;
>  	unsigned char		discard_misaligned;
>  	unsigned char		raid_partial_stripes_expensive;
> +
> +	unsigned short		nr_streams;
>  	enum blk_zoned_model	zoned;
>  };
>  
> @@ -567,8 +570,9 @@ struct request_queue {
>  	size_t			cmd_size;
>  
>  	struct work_struct	release_work;
> -
> -#define BLK_MAX_WRITE_HINTS	5
> +#define BLK_MAX_USER_HINTS	(WRITE_LIFE_KERN_MIN - 2)

WRITE_LIFE_KERN_MIN is undefined.

-Dave.

> +#define BLK_MAX_KERN_HINTS	4
> +#define BLK_MAX_WRITE_HINTS	(1 + BLK_MAX_USER_HINTS + BLK_MAX_KERN_HINTS)
>  	u64			write_hints[BLK_MAX_WRITE_HINTS];
>  };
>  
> @@ -1071,6 +1075,7 @@ extern void blk_queue_update_dma_alignment(struct request_queue *, int);
>  extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
>  extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable);
>  extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
> +extern void blk_queue_stream_limits(struct request_queue *, unsigned short);
>  
>  /*
>   * Number of physical segments as sent to the device.
> -- 
> 2.7.4
> 
> 

-- 
Dave Chinner
david@...morbit.com