Date: Mon, 12 Nov 2012 16:06:04 -0800 (PST) From: Sushanth Rai <sushanth_rai@yahoo.com> To: Konstantin Belousov <kostikbel@gmail.com>, Alan Cox <alc@rice.edu> Cc: alc@freebsd.org, pho@freebsd.org, StevenSears <Steven.Sears@netapp.com>, "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Subject: Re: Memory reserves or lack thereof Message-ID: <1352765164.25812.YahooMailClassic@web181702.mail.ne1.yahoo.com> In-Reply-To: <50A181C9.7030209@rice.edu>
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--- On Mon, 11/12/12, Alan Cox <alc@rice.edu> wrote: > From: Alan Cox <alc@rice.edu> > Subject: Re: Memory reserves or lack thereof > To: "Konstantin Belousov" <kostikbel@gmail.com> > Cc: "Sushanth Rai" <sushanth_rai@yahoo.com>, alc@freebsd.org, pho@freebsd.org, "StevenSears" <Steven.Sears@netapp.com>, "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> > Date: Monday, November 12, 2012, 3:10 PM > On 11/12/2012 3:48 PM, Konstantin > Belousov wrote: > > On Mon, Nov 12, 2012 at 01:28:02PM -0800, Sushanth Rai > wrote: > >> This patch still doesn't address the issue of > M_NOWAIT calls driving > >> the memory the all the way down to 2 pages, right ? > It would be nice to > >> have M_NOWAIT just do non-sleep version of M_WAITOK > and M_USE_RESERVE > >> flag to dig deep. > > This is out of scope of the change. But it is required > for any further > > adjustements. > > I would suggest a somewhat different response: > > The patch does make M_NOWAIT into a "non-sleep version of > M_WAITOK" and does reintroduce M_USE_RESERVE as a way to > specify "dig deep". > > Currently, both M_NOWAIT and M_WAITOK can drive the > cache/free memory down to two pages. The effect of the > patch is to stop M_NOWAIT at two pages rather than allowing > it to continue to zero pages. Thanks for the correction. I was associating VM_ALLOC_SYSTEM with just M_NOWAIT as it seemed in the first verion of the patch. Sushanth
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