Date: Tue, 24 Feb 2004 10:43:38 -0500 From: John Baldwin <jhb@FreeBSD.org> To: current@FreeBSD.org Cc: cg@FreeBSD.org Subject: Re: exclusive sleep mutex pcm0 (sound cdev) r = 0 Message-ID: <200402241043.38696.jhb@FreeBSD.org> In-Reply-To: <200402241527.i1OFRC7E074338@gw.catspoiler.org> References: <200402241527.i1OFRC7E074338@gw.catspoiler.org>
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On Tuesday 24 February 2004 10:27 am, Don Lewis wrote: > On 24 Feb, Jun Kuriyama wrote: > > I got this warning on my current box: > > > > malloc() of "256" with the following non-sleepable locks held: > > exclusive sleep mutex pcm0 (sound cdev) r = 0 (0xc73e63c0) locked @ > > dev/sound/pcm/dsp.c:213 > > > > I think there is no need to wait in vchan_create(). If kernel does > > not have resources to return small 256 bytes memory for sound device, > > we are not in the situation to care whether sound is played correctly > > or not... > > There are a bunch more problems with the "sound cdev" mutex, many of > which can't be fixed by this type of change unless having sporadic sound > system failures due to temporary malloc() failures is acceptable. > > I currently have some patches for the channel mutexes that are > undergoing testing. Once these have been committed, I'll take another > look at the "sound cdev" mutex. My current thought is to convert most > uses of it to a lockmgr lock. Eek, why not a sx lock if you must go to a sleepable lock? -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org
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