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| author | Andi Kleen <ak@suse.de> | 2006-06-26 13:59:11 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-26 10:48:21 -0700 |
| commit | 495ab9c045e1b0e5c82951b762257fe1c9d81564 (patch) | |
| tree | f95c376015d340794f64f36fd52f8fa80a1daab7 /arch/ia64 | |
| parent | d9005b52de7bc9b20afa93e06d3e15843bafc12f (diff) | |
| download | op-kernel-dev-495ab9c045e1b0e5c82951b762257fe1c9d81564.zip op-kernel-dev-495ab9c045e1b0e5c82951b762257fe1c9d81564.tar.gz | |
[PATCH] i386/x86-64/ia64: Move polling flag into thread_info_status
During some profiling I noticed that default_idle causes a lot of
memory traffic. I think that is caused by the atomic operations
to clear/set the polling flag in thread_info. There is actually
no reason to make this atomic - only the idle thread does it
to itself, other CPUs only read it. So I moved it into ti->status.
Converted i386/x86-64/ia64 for now because that was the easiest
way to fix ACPI which also manipulates these flags in its idle
function.
Cc: Nick Piggin <npiggin@novell.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Len Brown <len.brown@intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/ia64')
| -rw-r--r-- | arch/ia64/kernel/process.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c index 355d579..b045c27 100644 --- a/arch/ia64/kernel/process.c +++ b/arch/ia64/kernel/process.c @@ -272,9 +272,9 @@ cpu_idle (void) /* endless idle loop with no priority at all */ while (1) { if (can_do_pal_halt) - clear_thread_flag(TIF_POLLING_NRFLAG); + current_thread_info()->status &= ~TS_POLLING; else - set_thread_flag(TIF_POLLING_NRFLAG); + current_thread_info()->status |= TS_POLLING; if (!need_resched()) { void (*idle)(void); |
