x86: ignore the sys_getcpu() tcache parameter

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dont use the vgetcpu tcache - it's causing problems with tasks
migrating, they'll see the old cache up to a jiffy after the
migration, further increasing the costs of the migration.

In the worst case they see a complete bogus information from
the tcache, when a sys_getcpu() call "invalidated" the cache
info by incrementing the jiffies _and_ the cpuid info in the
cache and the following vdso_getcpu() call happens after
vdso_jiffies have been incremented.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Ulrich Drepper <drepper@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

...

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Ingo Molnar 2007-11-07 18:37:48 +01:00 • committed by Thomas Gleixner

parent 434b3d3209

commit 4307d1e5ad

2 changed files with 3 additions and 36 deletions

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kernel/sys.c

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