Messages in this thread | | | Subject | Re: [2.6 patch] i386: always use 4k stacks | Date | Fri, 16 Dec 2005 21:16:26 -0300 | From | Horst von Brand <> |
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Steven Rostedt <rostedt@goodmis.org> wrote: > On Fri, 2005-12-16 at 15:42 -0300, Horst von Brand wrote: > > linux-os \(Dick Johnson\) <linux-os@analogic.com> wrote: > > > > [...] > > > > > Throughout the past two years of 4k stack-wars, I never heard why > > > such a small stack was needed (not wanted, needed). It seems that > > > everybody "knows" that smaller is better and most everybody thinks > > > that one page in ix86 land is "optimum". However I don't think > > > anybody ever even tried to analyze what was better from a technical > > > perspective. Instead it's been analyzed as religious dogma, i.e., > > > keep the stack small, it will prevent idiots from doing bad things. > > > > OK, so here goes again... > > > > The kernel stack has to be contiguous in /physical/ memory. Keep the stack > > /one/ page, that way you can always get a new stack when needed (== each > > fork(2) or clone(2)). If the stack is 2 (or more) pages, you'll have to > > find (or create) a multi-page free area, and (fragmentation being what it > > is, and Linux routinely running for months at a time) you are in a whole > > new world of pain.
> So people should really be asking for a PAGE_SIZE = 8k option ;)
On i386 is is either 4KiB or 4MiB. Guess what I prefer... -- Dr. Horst H. von Brand User #22616 counter.li.org Departamento de Informatica Fono: +56 32 654431 Universidad Tecnica Federico Santa Maria +56 32 654239 Casilla 110-V, Valparaiso, Chile Fax: +56 32 797513
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