linux-kernel - Re: [ANN] Userspace M-on-N threading model implementation. Alpha release.

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:	Sun, 04 Feb 2007 15:12:32 -0500
From:	Bill Davidsen <davidsen@....com>
To:	Arjan van de Ven <arjan@...radead.org>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [ANN] Userspace M-on-N threading model implementation. Alpha
   release.

Arjan van de Ven wrote:
>> Because user threading can avoid context switches, there will always be 
>> cases where it will outperform o/s threads for hardware reasons.
> 
> actually.. switching from one "real" thread to another in Linux is not
> an actual context switch in the hardware sense... at least this part of
> your argument seems to be incorrect ;)
> 
How does that work? Switching between kernel threads requires going into 
the kernel, user level thread switches are all done in user mode.

Do you have some way to change o/s threads w/o going into the kernel?

-- 
Bill Davidsen <davidsen@....com>
   "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot
-
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/