x86, fpu: drop the fpu state during thread exit

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There is no need to save any active fpu state to the task structure
memory if the task is dead. Just drop the state instead.

For example, this saved some 1770 xsave's during the system boot
of a two socket Xeon system.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Link: http://lkml.kernel.org/r/1336692811-30576-4-git-send-email-suresh.b.siddha@intel.com
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

...

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Suresh Siddha 2012-05-16 15:03:54 -07:00 • committed by H. Peter Anvin

parent d75f1b391f

commit 1dcc8d7ba2

1 changed files with 13 additions and 6 deletions

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arch/x86/kernel/process.c

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