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Re: [RFC 5/7] use percpu_counters for res_counter usage [message #45725 is a reply to message #45719]

Fri, 30 March 2012 13:53

Glauber Costa
Messages: 916
Registered: October 2011

Senior Member

On 03/30/2012 11:58 AM, KAMEZAWA Hiroyuki wrote:
> ==
>
> Now, we do consume 'reserved' usage, we can avoid css_get(), an heavy atomic
> ops. You may need to move this code as
>
> rcu_read_lock()
> ....
> res_counter_charge()
> if (failure) {
> css_tryget()
> rcu_read_unlock()
> } else {
> rcu_read_unlock()
> return success;
> }
>
> to compare performance. This css_get() affects performance very very much.

thanks for the tip.

But one thing:

To be sure: it effectively mean that we are drawing from a dead memcg
(because we pre-allocated, right?

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[Message index]

		[RFC 0/7] Initial proposal for faster res_counter updates By: Glauber Costa on Fri, 30 March 2012 08:04
		[RFC 5/7] use percpu_counters for res_counter usage By: Glauber Costa on Fri, 30 March 2012 08:04
		Re: [RFC 5/7] use percpu_counters for res_counter usage By: KAMEZAWA Hiroyuki on Fri, 30 March 2012 09:33
		Re: [RFC 5/7] use percpu_counters for res_counter usage By: KAMEZAWA Hiroyuki on Fri, 30 March 2012 09:58
		Re: [RFC 5/7] use percpu_counters for res_counter usage By: Glauber Costa on Fri, 30 March 2012 13:53
		Re: [RFC 5/7] use percpu_counters for res_counter usage By: KAMEZAWA Hiroyuki on Mon, 09 April 2012 01:48
		Re: [RFC 5/7] use percpu_counters for res_counter usage By: Glauber Costa on Fri, 30 March 2012 12:59
		[RFC 6/7] Add min and max statistics to percpu_counter By: Glauber Costa on Fri, 30 March 2012 08:04
		[RFC 7/7] Global optimization By: Glauber Costa on Fri, 30 March 2012 08:04
		[RFC 4/7] move res_counter_set limit to res_counter.c By: Glauber Costa on Fri, 30 March 2012 08:04
		[RFC 3/7] bundle a percpu counter into res_counters and use its lock By: Glauber Costa on Fri, 30 March 2012 08:04
		[RFC 2/7] consolidate all res_counter manipulation By: Glauber Costa on Fri, 30 March 2012 08:04
		Re: [RFC 0/7] Initial proposal for faster res_counter updates By: KAMEZAWA Hiroyuki on Fri, 30 March 2012 08:32
		Re: [RFC 0/7] Initial proposal for faster res_counter updates By: Glauber Costa on Fri, 30 March 2012 10:46

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