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Date: Fri, 30 Apr 2010 06:24:43 +0200 From: Tejun Heo <tj@...nel.org> To: "Rafael J. Wysocki" <rjw@...k.pl> CC: Arve Hjønnevåg <arve@...roid.com>, linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org, Alan Stern <stern@...land.harvard.edu>, Oleg Nesterov <oleg@...hat.com>, Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>, Randy Dunlap <rdunlap@...otime.net>, Jesse Barnes <jbarnes@...tuousgeek.org>, Magnus Damm <damm@...l.co.jp>, Nigel Cunningham <nigel@...onice.net>, Cornelia Huck <cornelia.huck@...ibm.com>, Ming Lei <tom.leiming@...il.com>, Wu Fengguang <fengguang.wu@...el.com>, Andrew Morton <akpm@...ux-foundation.org>, Maxim Levitsky <maximlevitsky@...il.com>, linux-doc@...r.kernel.org Subject: Re: [PATCH 1/8] PM: Add suspend block api. Hello, On 04/29/2010 11:16 PM, Rafael J. Wysocki wrote: >>> Also, we already have one PM workqueue. It is used for runtime PM, but I guess >>> it may be used just as well for the opportunistic suspend. It is freezable, >>> but would it hurt? >> >> No, it works, the freezable flag is just ignored when I call >> pm_suspend and I don't run anything else on the workqueue while >> threads are frozen. It does need to be a single threaded workqueue >> though, so make sure you don't just change that. > > Freezable workqueues have to be singlethread or else there will be unfixable > races, so you can safely assume things will stay as they are in this respect. Rafael, can you elaborate a bit more on this? Just in case I missed something while doing cmwq as it currently doesn't have such limit. Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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