netdev - Re: [Lsf] [Lsf-pc] [LSF/MM TOPIC] Generic page-pool recycle facility?

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Date:	Sun, 10 Apr 2016 21:45:47 +0300
From:	Sagi Grimberg <sagi@...mberg.me>
To:	Bart Van Assche <bart.vanassche@...disk.com>,
	Christoph Hellwig <hch@...radead.org>,
	Jesper Dangaard Brouer <brouer@...hat.com>
Cc:	"lsf@...ts.linux-foundation.org" <lsf@...ts.linux-foundation.org>,
	Tom Herbert <tom@...bertland.com>,
	Brenden Blanco <bblanco@...mgrid.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	linux-mm <linux-mm@...ck.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"lsf-pc@...ts.linux-foundation.org" 
	<lsf-pc@...ts.linux-foundation.org>,
	Alexei Starovoitov <alexei.starovoitov@...il.com>
Subject: Re: [Lsf] [Lsf-pc] [LSF/MM TOPIC] Generic page-pool recycle facility?


>> This is also very interesting for storage targets, which face the same
>> issue.  SCST has a mode where it caches some fully constructed SGLs,
>> which is probably very similar to what NICs want to do.
>
> I think a cached allocator for page sets + the scatterlists that
> describe these page sets would not only be useful for SCSI target
> implementations but also for the Linux SCSI initiator. Today the scsi-mq
> code reserves space in each scsi_cmnd for a scatterlist of
> SCSI_MAX_SG_SEGMENTS. If scatterlists would be cached together with page
> sets less memory would be needed per scsi_cmnd.

If we go down this road how about also attaching some driver opaques
to the page sets?

I know of some drivers that can make good use of those ;)