linux-kernel - Re: [RFC] NUMA futex hashing

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Message-ID: <44D94142.3050703@yahoo.com.au>
Date:	Wed, 09 Aug 2006 11:58:26 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Ulrich Drepper <drepper@...il.com>
CC:	Eric Dumazet <dada1@...mosbay.com>, Andi Kleen <ak@...e.de>,
	Ravikiran G Thirumalai <kiran@...lex86.org>,
	"Shai Fultheim (Shai@...lex86.org)" <shai@...lex86.org>,
	pravin b shelar <pravin.shelar@...softinc.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] NUMA futex hashing

Ulrich Drepper wrote:

>> Of course we would need a new syscall, and to change glibc to be able to
>> actually use this new private_futex syscall.
>
>
> No, why?  The kernel already does recognize private mutexes.  It just
> checks whether the pages used to store it are private or mapped.  This
> requires some interaction with the memory subsystem but as long as no
> crashes happen the data can change underneath.  It's the program's
> fault if it does.


Because that requires taking mmap_sem. Avoiding that is the whole
purpose, isn't it?

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