Date: Thu, 20 Dec 2001 12:41:11 -0800 (PST) From: John Baldwin <jhb@FreeBSD.org> To: Luigi Rizzo <rizzo@aciri.org> Cc: Peter Wemm <peter@wemm.org>, current@FreeBSD.org Subject: Re: vm_zeropage priority problems. Message-ID: <XFMail.011220124111.jhb@FreeBSD.org> In-Reply-To: <20011220123602.H8230@iguana.aciri.org>
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On 20-Dec-01 Luigi Rizzo wrote: > On Thu, Dec 20, 2001 at 12:16:03PM -0800, John Baldwin wrote: > ... >> Priority propagation will already handle things ok. We drop to pri_native >> after we drop a lock (although if we still hold a contested lock we bump our >> priority to the min(nativepri, highest priority of threads on contested >> locks >> we hold and drop to nativepri after dropping the last contested lock). > > ok, thanks for the clarification > >> However, kthreads should tsleep() with their current priority, not PPAUSE. > > "current" meaning pri_level or pri_native ? What if one tries to > tsleep() while holding a lock and so its pri_level is raised ? pri_level. Calling tsleep() while holding a lock is a bug though. :) Unless you are calling msleep() with a lock that will be released. > In the device polling code i did a tsleep on the "original" pri_level, > but maybe pri_native is good enough. pri_level is more correct. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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