linux-kernel - Re: [Intel-IOMMU 02/10] Library routine for pre-allocat pool handling

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: <20070608135555.e580ada3.akpm@linux-foundation.org>
Date:	Fri, 8 Jun 2007 13:55:55 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Andreas Kleen <ak@...e.de>
Cc:	"Keshavamurthy, Anil S" <anil.s.keshavamurthy@...el.com>,
	linux-kernel@...r.kernel.org, gregkh@...e.de, muli@...ibm.com,
	asit.k.mallick@...el.com, suresh.b.siddha@...el.com,
	arjan@...ux.intel.com, ashok.raj@...el.com, shaohua.li@...el.com,
	davem@...emloft.net
Subject: Re: [Intel-IOMMU 02/10] Library routine for pre-allocat pool
 handling

On Fri, 8 Jun 2007 22:43:10 +0200 (CEST)
Andreas Kleen <ak@...e.de> wrote:

> > That's what kmem_cache_alloc() is for?!?!
> 
> Tradtionally that was not allowed in block layer path. Not sure
> it is fully obsolete with the recent dirty tracking work, probably not.
> 
> Besides it would need to be GFP_ATOMIC and the default
> atomic pools are not that big.

That in itself is a problem.  What do we have to do to be able
to make these allocations use the *much* stronger GFP_NOIO?

We could perhaps talk to Christoph about arranging for each slabcache to
have an optional private reserve page pool.  But fixing the GFP_ATOMIC
would be better.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/