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

[Darren Hart]

On Thu, May 05, 2016 at 08:44:05PM -0000, Thomas Gleixner wrote:
> From: Sebastian Siewior <bigeasy@xxxxxxxxxxxxx>
> 
> 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@xxxxxxxxxxxxx>
> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> ---
>  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