Re: [2.6 patch] i386: always use 4k stacks

From: jmerkey (jmerkey_at_utah-nac.org)
Date: 11/16/05

  • Next message: Nick Warne: "2.4.31 make - path name breakage (perhaps)" 
    Date:	Wed, 16 Nov 2005 07:42:06 -0700
To: Jörn Engel <joern@wohnheim.fh-wedel.de>

    Jörn Engel wrote:

    >On Wed, 16 November 2005 13:57:36 +0100, Andi Kleen wrote:
    >
    >
    >>I think it's in general risky. It's like balancing without a safety
    >>net. Might be a nice hobby, but for real production you want a safety
    >>net. That's simple because there are likely some code paths through
    >>the code that need more stack space and that are rarely hit (and
    >>cannot be easily found by static analysis, e.g. if they involve
    >>indirect pointers or particularly complex configuration setups).
    >>
    >>
    >
    >It isn't that hard to find such places. Trouble is that you find so
    >many of them and it takes quite a while to go through them all. Years
    >is a good unit for "quite a while".
    >
    >Jörn
    >
    >
    >
    Map a blank ro page beneath the address range when stack memory is
    mapped is trap on page faults to the page when folks go off the end of
    th e stack.

    Easy to find.

    Jeff
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