linux-kernel - Re: [patch V2 4/7] futex: Add sysctl knobs for process private hash

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Message-ID: <20160506182204.GG48432@f23x64.localdomain>
Date:	Fri, 6 May 2016 11:22:04 -0700
From:	Darren Hart <dvhart@...radead.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Darren Hart <darren@...art.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Michael Kerrisk <mtk.manpages@...glemail.com>,
	Davidlohr Bueso <dave@...olabs.net>, Chris Mason <clm@...com>,
	Carlos O'Donell <carlos@...hat.com>,
	Torvald Riegel <triegel@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>
Subject: Re: [patch V2 4/7] futex: Add sysctl knobs for process private hash

On Thu, May 05, 2016 at 08:44:05PM -0000, Thomas Gleixner wrote:
> From: Sebastian Siewior <bigeasy@...utronix.de>
> 
> To adjust the default hash size and the maximum hash size for process private
> futexes we add the following sysctls:
> 
> futex_private_default_hash_bits:
> 
>      Adjusts the default hash size (in bits) which is used for automatic hash
>      allocations on the first futex operation
> 
> futex_private_max_hash_bits:
> 
>      Adjusts the maximum hash size (in bits). This limits the hash size which
>      can be preallocated by applications with the FUTEX_PREALLOC_HASH op.
> 
> Signed-off-by: Sebastian Siewior <bigeasy@...utronix.de>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---
>  Documentation/sysctl/kernel.txt |   17 +++++++++++++++++
>  include/linux/futex.h           |    1 +
>  kernel/futex.c                  |    5 +++--
>  kernel/sysctl.c                 |   21 +++++++++++++++++++++
>  4 files changed, 42 insertions(+), 2 deletions(-)
> 
> --- a/Documentation/sysctl/kernel.txt
> +++ b/Documentation/sysctl/kernel.txt
> @@ -29,6 +29,8 @@ Currently, these files might (depending
>  - core_pipe_limit
>  - core_uses_pid
>  - ctrl-alt-del
> +- futex_private_default_hash_bits
> +- futex_private_max_hash_bits

This list (this context anyway) looks to have been alphabetical previously,
consider moving futex* between domainname and hostname?


-- 
Darren Hart
Intel Open Source Technology Center