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Re: [RFC PATCH v2] posix timers: allocate timer id per task [message #48427 is a reply to message #48426]

Wed, 17 October 2012 13:44

Eric Dumazet
Messages: 36
Registered: July 2006

Member

On Wed, 2012-10-17 at 17:18 +0400, Stanislav Kinsbursky wrote:

> +static int hash(struct signal_struct *sig, unsigned int nr)
> +{
> + int hash = hash_ptr(sig, POSIX_TIMERS_HASH_BITS);
> + return hash ^ hash_32(nr, POSIX_TIMERS_HASH_BITS);
> +}
> +

This is quite expensive on 64 bit arches. I suggest instead :

return hash_32(hash32_ptr(sig) ^ nr, POSIX_TIMERS_HASH_BITS);

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[Message index]

		[RFC PATCH v2] posix timers: allocate timer id per task By: Stanislav Kinsbursky on Wed, 17 October 2012 13:17
		Re: [RFC PATCH v2] posix timers: allocate timer id per task By: Eric Dumazet on Wed, 17 October 2012 13:44
		Re: [RFC PATCH v2] posix timers: allocate timer id per task By: Stanislav Kinsbursky on Wed, 17 October 2012 14:19
		Re: [RFC PATCH v2] posix timers: allocate timer id per task By: Eric Dumazet on Wed, 17 October 2012 13:57
		Re: [RFC PATCH v2] posix timers: allocate timer id per task By: Stanislav Kinsbursky on Wed, 17 October 2012 14:26

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