[patch 0/2] x86,pat: Reduce contention on the memtype_lock -V3

From: holt
Date: Mon Mar 15 2010 - 09:21:33 EST



Tracking memtype on x86 uses a single global spin_lock for either reading
or changing the memory type. This includes changes made to page flags
which is perfectly parallel.

Part one of the patchset makes the page-based tracking use cmpxchg
without a need for a lock.

Part two of the patchset converts the spin_lock into a read/write lock.


To: Ingo Molnar <mingo@xxxxxxxxxx>
To: H. Peter Anvin <hpa@xxxxxxxxx>
To: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Robin Holt <holt@xxxxxxx>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi@xxxxxxxxx>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi@xxxxxxxxx>
Cc: Suresh Siddha <suresh.b.siddha@xxxxxxxxx>
Cc: Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>
Cc: x86@xxxxxxxxxx

---

arch/x86/include/asm/cacheflush.h | 44 +++++++++++++++++++++-----------------
arch/x86/mm/pat.c | 28 ++++++++----------------
2 files changed, 35 insertions(+), 37 deletions(-)
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