linux-kernel - Re: [PATCH V2] lightnvm: pblk: add tracing for chunk resets

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Date:   Tue, 4 Sep 2018 12:57:18 +0200
From:   Matias Bjørling <mb@...htnvm.io>
To:     hans.ml.holmberg@...tronix.com
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        javier@...xlabs.com, hans.holmberg@...xlabs.com
Subject: Re: [PATCH V2] lightnvm: pblk: add tracing for chunk resets

On 09/04/2018 12:38 PM, Hans Holmberg wrote:
> From: Hans Holmberg <hans.holmberg@...xlabs.com>
> 
> Trace state of chunk resets.
> 
> Signed-off-by: Hans Holmberg <hans.holmberg@...xlabs.com>
> Signed-off-by: Matias Bjørling <mb@...htnvm.io>
> 
> ---
> 
> You already picked up the first version of this patch Matias,
> but here's a V2 adressing the review comment from Javier that came
> after that.
> 
> Changes in V2:
> 	Moved the synchronous PBLK_CHUNK_RESET_START trace to
> 	pblk_blk_erase_sync (as Javier suggested)
> 
>   drivers/lightnvm/pblk-core.c  | 12 ++++++++++++
>   drivers/lightnvm/pblk-trace.h | 31 +++++++++++++++++++++++++++++++
>   drivers/lightnvm/pblk.h       |  6 ++++++
>   3 files changed, 49 insertions(+)
> 
> diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c
> index 73f117bc99a9..951f81a1b273 100644
> --- a/drivers/lightnvm/pblk-core.c
> +++ b/drivers/lightnvm/pblk-core.c
> @@ -90,9 +90,15 @@ static void __pblk_end_io_erase(struct pblk *pblk, struct nvm_rq *rqd)
>   	atomic_dec(&line->left_seblks);
>   
>   	if (rqd->error) {
> +		trace_pblk_chunk_reset(pblk_disk_name(pblk),
> +				&rqd->ppa_addr, PBLK_CHUNK_RESET_FAILED);
> +
>   		chunk->state = NVM_CHK_ST_OFFLINE;
>   		pblk_mark_bb(pblk, line, rqd->ppa_addr);
>   	} else {
> +		trace_pblk_chunk_reset(pblk_disk_name(pblk),
> +				&rqd->ppa_addr, PBLK_CHUNK_RESET_DONE);
> +
>   		chunk->state = NVM_CHK_ST_FREE;
>   	}
>   
> @@ -923,6 +929,9 @@ static int pblk_blk_erase_sync(struct pblk *pblk, struct ppa_addr ppa)
>   	struct nvm_rq rqd = {NULL};
>   	int ret;
>   
> +	trace_pblk_chunk_reset(pblk_disk_name(pblk), &ppa,
> +				PBLK_CHUNK_RESET_START);
> +
>   	pblk_setup_e_rq(pblk, &rqd, ppa);
>   
>   	/* The write thread schedules erases so that it minimizes disturbances
> @@ -1736,6 +1745,9 @@ int pblk_blk_erase_async(struct pblk *pblk, struct ppa_addr ppa)
>   	rqd->end_io = pblk_end_io_erase;
>   	rqd->private = pblk;
>   
> +	trace_pblk_chunk_reset(pblk_disk_name(pblk),
> +				&ppa, PBLK_CHUNK_RESET_START);
> +
>   	/* The write thread schedules erases so that it minimizes disturbances
>   	 * with writes. Thus, there is no need to take the LUN semaphore.
>   	 */
> diff --git a/drivers/lightnvm/pblk-trace.h b/drivers/lightnvm/pblk-trace.h
> index c171d0450c07..679e5c458ca6 100644
> --- a/drivers/lightnvm/pblk-trace.h
> +++ b/drivers/lightnvm/pblk-trace.h
> @@ -31,6 +31,37 @@ struct ppa_addr;
>   	{ PBLK_STATE_RECOVERING,	"RECOVERING",	},	\
>   	{ PBLK_STATE_STOPPED,		"STOPPED"	})
>   
> +#define show_chunk_erase_state(state) __print_symbolic(state,	\
> +	{ PBLK_CHUNK_RESET_START,	"START",	},	\
> +	{ PBLK_CHUNK_RESET_DONE,	"OK",		},	\
> +	{ PBLK_CHUNK_RESET_FAILED,	"FAILED"	})
> +
> +
> +TRACE_EVENT(pblk_chunk_reset,
> +
> +	TP_PROTO(const char *name, struct ppa_addr *ppa, int state),
> +
> +	TP_ARGS(name, ppa, state),
> +
> +	TP_STRUCT__entry(
> +		__string(name, name)
> +		__field(u64, ppa)
> +		__field(int, state);
> +	),
> +
> +	TP_fast_assign(
> +		__assign_str(name, name);
> +		__entry->ppa = ppa->ppa;
> +		__entry->state = state;
> +	),
> +
> +	TP_printk("dev=%s grp=%llu pu=%llu chk=%llu state=%s", __get_str(name),
> +			(u64)(((struct ppa_addr *)(&__entry->ppa))->m.grp),
> +			(u64)(((struct ppa_addr *)(&__entry->ppa))->m.pu),
> +			(u64)(((struct ppa_addr *)(&__entry->ppa))->m.chk),
> +			show_chunk_erase_state((int)__entry->state))
> +
> +);
>   
>   TRACE_EVENT(pblk_chunk_state,
>   
> diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h
> index ae705fb52cf7..f0fcd963ab3a 100644
> --- a/drivers/lightnvm/pblk.h
> +++ b/drivers/lightnvm/pblk.h
> @@ -79,6 +79,12 @@ enum {
>   	PBLK_BLK_ST_CLOSED =	0x2,
>   };
>   
> +enum {
> +	PBLK_CHUNK_RESET_START,
> +	PBLK_CHUNK_RESET_DONE,
> +	PBLK_CHUNK_RESET_FAILED,
> +};
> +
>   struct pblk_sec_meta {
>   	u64 reserved;
>   	__le64 lba;
> 

Thanks. Applied for 4.20 (replaced the previous one)