Re: [PATCH] Reduce stack usage in acct.c

From: Adrian Bunk (bunk_at_stusta.de)
Date: 03/31/05

  • Next message: Miklos Szeredi: "[PATCH] FUSE: 0/3 update kernel ABI" 
    Date:	Thu, 31 Mar 2005 22:40:39 +0200
To: "Randy.Dunlap" <rddunlap@osdl.org>

    On Thu, Mar 31, 2005 at 12:09:54PM -0800, Randy.Dunlap wrote:
    > Jörn Engel wrote:
    >...
    > >In principle, all recursive paths should consume as little stack as
    > >possible. Or the recursion itself could be avoided, even better. And
    > >some of the call chains with ~3k of stack consumption may be
    > >problematic on other platforms, like the x86-64. Taking care of those
    > >could result in smaller stacks for the respective platform.
    >
    > Here is 2.6.12-rc1-bk3 raw checkstack output on x86-64:
    > http://developer.osdl.org/~rddunlap/doc/checkstack1.out

    Looking at the stack usage numbers, this was with a gcc that supports
    unit-at-a-time.

    If you use gcc 3.4 and enable unit-at-a-time (see my other email) the
    i386 numbers look quite similar.

    I doubt there are many architecture or 64 bit [1] specific stack usage
    problems, so working on i386 might be enough.

    > ~Randy

    cu
    Adrian

    [1] theoretically a factor of two was possible due to the different
        pointer sizes - but I have yet to see any example where this
        really matters 

    -- 
       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed
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