linux-kernel - Re: [patch V2 00/20] timer: Refactor the timer wheel

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Date:	Fri, 17 Jun 2016 07:26:08 -0700
From:	Arjan van de Ven <arjanvandeven@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Chris Mason <clm@...com>,
	Arjan van de Ven <arjan@...radead.org>, rt@...utronix.de,
	Rik van Riel <riel@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	George Spelvin <linux@...encehorizons.net>,
	Len Brown <lenb@...nel.org>
Subject: Re: [patch V2 00/20] timer: Refactor the timer wheel

>    To achieve this capacity with HZ=1000 without increasing the storage size
>    by another level, we reduced the granularity of the first wheel level from
>    1ms to 4ms. According to our data, there is no user which relies on that
>    1ms granularity and 99% of those timers are canceled before expiry.


the only likely problem cases are msleep(1) uses... but we could just
map those to usleep(1000,2000)

(imo we should anyway)