mm: vmstats: track TLB flush stats on UP too
authorDave Hansen <dave@sr71.net>
Wed, 11 Sep 2013 21:20:24 +0000 (14:20 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 11 Sep 2013 22:57:09 +0000 (15:57 -0700)
commit6df46865ff8715932e7d42e52cac17e8461758cb
tree7c7e1d43b22a2bec2d4a6fce95ddc3cbd481aa1e
parent9824cf9753ecbe8f5b47aa9b2f218207defea211
mm: vmstats: track TLB flush stats on UP too

The previous patch doing vmstats for TLB flushes ("mm: vmstats: tlb flush
counters") effectively missed UP since arch/x86/mm/tlb.c is only compiled
for SMP.

UP systems do not do remote TLB flushes, so compile those counters out on
UP.

arch/x86/kernel/cpu/mtrr/generic.c calls __flush_tlb() directly.  This is
probably an optimization since both the mtrr code and __flush_tlb() write
cr4.  It would probably be safe to make that a flush_tlb_all() (and then
get these statistics), but the mtrr code is ancient and I'm hesitant to
touch it other than to just stick in the counters.

[akpm@linux-foundation.org: tweak comments]
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/x86/include/asm/tlbflush.h
arch/x86/kernel/cpu/mtrr/generic.c
arch/x86/mm/tlb.c
include/linux/vm_event_item.h
mm/vmstat.c