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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <570A9F5B.5010600@grimberg.me>
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 ;)