x86, fpu: drop the fpu state during thread exit

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>

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index b7e1e0e5398756a61bbad2d79b0a30e14ba64bfa..1219fe2be8f39230676e82658321f92f7e60a2ee 100644 (file)
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -87,6 +87,16 @@ void arch_task_cache_init(void)
                                  SLAB_PANIC | SLAB_NOTRACK, NULL);
 }
 
+static inline void drop_fpu(struct task_struct *tsk)
+{
+       /*
+        * Forget coprocessor state..
+        */
+       tsk->fpu_counter = 0;
+       clear_fpu(tsk);
+       clear_used_math();
+}
+
 /*
  * Free current thread data structures etc..
  */
@@ -109,6 +119,8 @@ void exit_thread(void)
                put_cpu();
                kfree(bp);
        }
+
+       drop_fpu(me);
 }
 
 void show_regs(struct pt_regs *regs)
@@ -149,12 +161,7 @@ void flush_thread(void)
 
        flush_ptrace_hw_breakpoint(tsk);
        memset(tsk->thread.tls_array, 0, sizeof(tsk->thread.tls_array));
-       /*
-        * Forget coprocessor state..
-        */
-       tsk->fpu_counter = 0;
-       clear_fpu(tsk);
-       clear_used_math();
+       drop_fpu(tsk);
 }
 
 static void hard_disable_TSC(void)