Messages in this thread | | | Date | Sun, 11 Jul 2004 04:38:03 -0400 (EDT) | From | Ingo Molnar <> | Subject | Re: serious performance regression due to NX patch |
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On Fri, 9 Jul 2004, David Mosberger wrote:
> The "No eXecute patch for x86" causes a serious exec() performance > degradation on ia64 since it ends up incorrectly turning on the execute > protection on all segments (since most ia64 binaries don't have a > gnu_stack program-header). > > The patch below fixes the problem by turning on VM_EXEC and VM_MAYEXEC > only if VM_DATA_DEFAULT_FLAGS mentions them. Note that on ia64, the > value of VM_DATA_DEFAULT_FLAGS depends on the personality (to support > x86 binaries) and hence I had to move the setting of "def_flags" down a > bit to a point after SET_PERSONALITY() has been done. > > Please apply.
ok, agreed. I'll check that it still does the right thing on x86.
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