linux-kernel - Re: [GIT PULL v2] Early SLAB fixes for 2.6.31

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]

Date:	Sat, 13 Jun 2009 07:46:03 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Pekka J Enberg <penberg@...helsinki.fi>,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, kamezawa.hiroyu@...fujitsu.com,
	lizf@...fujitsu.com, mingo@...e.hu, npiggin@...e.de,
	yinghai@...nel.org
Subject: Re: [GIT PULL v2] Early SLAB fixes for 2.6.31


> Adds code to hot code path.

A single mask which should be mostly in the noise...

> The allocators mask flags passed to the page allocator through
> GFP_RECLAIM_MASK|GFP_CONSTRAINT_MASK. This is done outside of the critical
> code paths.
> 
> The might_sleep issues may be fixed by adding another check to
> __might_sleep().

That is not enough because slab and slub explicitely re-enable
interrupts when __GFP_WAIT is set, which is the problem we need to solve
in the first place, so we need to do the masking there.

Cheers,
Ben.


--
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/