linux-kernel - Re: [PATCH 08/14] staging/lustre/ldlm: engage ELC for all ldlm enqueue req

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Date:   Mon, 7 Nov 2016 01:55:21 +0000 (GMT)
From:   James Simmons <jsimmons@...radead.org>
To:     Oleg Drokin <green@...uxhacker.ru>
cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org,
        Andreas Dilger <andreas.dilger@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Lustre Development List <lustre-devel@...ts.lustre.org>,
        Hongchao Zhang <hongchao.zhang@...el.com>
Subject: Re: [PATCH 08/14] staging/lustre/ldlm: engage ELC for all ldlm
 enqueue req


> From: Hongchao Zhang <hongchao.zhang@...el.com>
> 
> If there is no request passed into ldlm_cli_enqueue, the enqueue
> request will not engage ELC to drop unneeded locks. currently,
> this kind of request is mainly related to EXTENT locks enqueue
> requests (except for glimpse EXTENT lock for it has an intent).

Reviewed-by: James Simmons <jsimmons@...radead.org>
 
> Signed-off-by: Hongchao Zhang <hongchao.zhang@...el.com>
> Reviewed-on: http://review.whamcloud.com/21739
> Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-8209
> Reviewed-by: Andreas Dilger <andreas.dilger@...el.com>
> Reviewed-by: Vitaly Fertman <vitaly.fertman@...gate.com>
> Signed-off-by: Oleg Drokin <green@...uxhacker.ru>
> ---
>  drivers/staging/lustre/lustre/ldlm/ldlm_request.c | 21 ++++-----------------
>  1 file changed, 4 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/staging/lustre/lustre/ldlm/ldlm_request.c b/drivers/staging/lustre/lustre/ldlm/ldlm_request.c
> index 1b9ae77..c5d00d1 100644
> --- a/drivers/staging/lustre/lustre/ldlm/ldlm_request.c
> +++ b/drivers/staging/lustre/lustre/ldlm/ldlm_request.c
> @@ -748,17 +748,14 @@ int ldlm_cli_enqueue(struct obd_export *exp, struct ptlrpc_request **reqp,
>  	lock->l_last_activity = ktime_get_real_seconds();
>  
>  	/* lock not sent to server yet */
> -
>  	if (!reqp || !*reqp) {
> -		req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
> -						&RQF_LDLM_ENQUEUE,
> -						LUSTRE_DLM_VERSION,
> -						LDLM_ENQUEUE);
> -		if (!req) {
> +		req = ldlm_enqueue_pack(exp, lvb_len);
> +		if (IS_ERR(req)) {
>  			failed_lock_cleanup(ns, lock, einfo->ei_mode);
>  			LDLM_LOCK_RELEASE(lock);
> -			return -ENOMEM;
> +			return PTR_ERR(req);
>  		}
> +
>  		req_passed_in = 0;
>  		if (reqp)
>  			*reqp = req;
> @@ -778,16 +775,6 @@ int ldlm_cli_enqueue(struct obd_export *exp, struct ptlrpc_request **reqp,
>  	body->lock_flags = ldlm_flags_to_wire(*flags);
>  	body->lock_handle[0] = *lockh;
>  
> -	/* Continue as normal. */
> -	if (!req_passed_in) {
> -		if (lvb_len > 0)
> -			req_capsule_extend(&req->rq_pill,
> -					   &RQF_LDLM_ENQUEUE_LVB);
> -		req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
> -				     lvb_len);
> -		ptlrpc_request_set_replen(req);
> -	}
> -
>  	/*
>  	 * Liblustre client doesn't get extent locks, except for O_APPEND case
>  	 * where [0, OBD_OBJECT_EOF] lock is taken, or truncate, where
> -- 
> 2.7.4
> 
>