On Thu, 31 Jan 2008 10:53:26 +0100 Peter Zijlstra <[EMAIL PROTECTED]> wrote:
> > On Thu, 2008-01-31 at 01:47 -0800, Andrew Morton wrote: > > On Thu, 31 Jan 2008 10:35:18 +0100 Peter Zijlstra <[EMAIL PROTECTED]> wrote: > > > > > > > > On Thu, 2008-01-31 at 01:12 -0800, Andrew Morton wrote: > > > > > > > Implementation-wise: make_pages_present() _can_ be converted to do > > > > this. > > > > But it's a lot of patching, and the result will be a cleaner, faster and > > > > smaller core MM. Whereas your approach is easy, but adds more code and > > > > leaves the old stuff slow-and-dirty. > > > > > > > > Guess which approach is preferred? ;) > > > > > > Ok, I'll look at using make_pages_present(). > > > > Am still curious to know what inspired this change. What are the use > > cases? Performance testing results, etc? > > Ah, that is Lennarts Pulse Audio thing, he has samples in memory which > might not have been used for a while, and he wants to be able to > pre-fetch those when he suspects they might need to be played. So that > once the audio thread comes along and stuffs them down /dev/dsp its all > nice in memory. > > Since its all soft real-time at best he feels its better to do a best > effort at not hitting swap than it is to strain the system with mlock > usage. hrm. Does he know about pthread_create()? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
