linux-kernel - Re: [RFC][PATCH] lru_add_drain_all() don't use schedule_on_each

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Message-ID: <2f11576a0810260637q21eaec62q4e2662742541e771@mail.gmail.com>
Date:	Sun, 26 Oct 2008 22:37:50 +0900
From:	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>
To:	"Peter Zijlstra" <peterz@...radead.org>
Cc:	"Heiko Carstens" <heiko.carstens@...ibm.com>,
	"Nick Piggin" <npiggin@...e.de>, linux-kernel@...r.kernel.org,
	"Hugh Dickins" <hugh@...itas.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Rik van Riel" <riel@...hat.com>,
	"Lee Schermerhorn" <lee.schermerhorn@...com>, linux-mm@...ck.org,
	"Christoph Lameter" <cl@...ux-foundation.org>,
	"Gautham Shenoy" <ego@...ibm.com>,
	"Oleg Nesterov" <oleg@...sign.ru>,
	"Rusty Russell" <rusty@...tcorp.com.au>
Subject: Re: [RFC][PATCH] lru_add_drain_all() don't use schedule_on_each_cpu()

Hi Peter,

>> @@ -611,4 +613,8 @@ void __init swap_setup(void)
>>  #ifdef CONFIG_HOTPLUG_CPU
>>       hotcpu_notifier(cpu_swap_callback, 0);
>>  #endif
>> +
>> +     vm_wq = create_workqueue("vm_work");
>> +     BUG_ON(!vm_wq);
>> +
>>  }
>
> While I really hate adding yet another per-cpu thread for this, I don't
> see another way out atm.

Can I ask the reason of your hate?
if I don't know it, making improvement patch is very difficult to me.


> Oleg, Rusty, ego, you lot were discussing a similar extra per-cpu
> workqueue, can we merge these two?
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