linux-kernel - Re: pthread_create() slow for many threads; also time to revisit 64b context switch optimization?

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: <48A3266F.9000908@redhat.com>
Date:	Wed, 13 Aug 2008 11:22:39 -0700
From:	Ulrich Drepper <drepper@...hat.com>
To:	Arjan van de Ven <arjan@...radead.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, akpm@...ux-foundation.org,
	hugh@...itas.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	briangrant@...gle.com, cgd@...gle.com, mbligh@...gle.com,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: pthread_create() slow for many threads; also time to revisit
 64b context switch optimization?

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Arjan van de Ven wrote:
> yeah maybe we should also tell it we expect it to be used downwards.
> Oh wait.. MAP_GROWSDOWN ?

MAP_GROWSDOWN is unusable because we have to allocate the entire address
range for the stack.  Otherwise some other allocation happens in that
range and all of a sudden the stack cannot grow as much as needed anymore.

These flags really can be removed.  They should not be used because they
are outright dangerous.

- --
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (GNU/Linux)

iEYEARECAAYFAkijJm8ACgkQ2ijCOnn/RHQ7/wCfcrLJPlKmtY5AC3c+fuX9LGe8
+YwAnRqLCdSQvwOUdsAz8Hq9H3dmnqEA
=BKsz
-----END PGP SIGNATURE-----
--
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/