Re: git: kernel - Fix some rare pmap races in i386 and x86_64.
:Err, this warning is totally meaningless to an administrator or pretty
:much anybody who didn't read this patch. Wouldn't something like
:
:kprintf("Diagnostic: pmap_interlock %08x. Please report this!\n",
:pmap->pm_active)
:
:or even
:
:kprintf("Wow. pmap_interlock %08x. Please report this!\n", pmap->pm_active)
:
:be more useful to both sides?
:
:Aggelos
It's really just something for my own debugging, to make sure that
the case actually occurs. I suspect I'll remove it by the release
but if you want to change the message please be my guest :-)
--
I can produce the warning when I start blogbench on x86_64.
Interestingly enough it only happens after a fresh machine start,
presumably due to the paging in of program binary pages that are not
primed not in the cache yet. Every subsequent run of blogbench failed
to produce any new warnings.
I have hopes that either this or the missing critical sections patched
at the same time might also be the cause of the rare seg-faults seen
on x86_64 on things like cc1 (not stuff like conftest from pkgsrc),
which again only appear to occur soon after the machine has booted.
It's really hard to test the x86_64 issue because I have to do
a reboot, then make -j 4 buildworld, then reboot, etc.
-Matt
Matthew Dillon
<dillon@backplane.com>
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