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From: holt on 23 Mar 2010 20:40

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(a)redhat.com>
To: H. Peter Anvin <hpa(a)zytor.com>
To: Thomas Gleixner <tglx(a)linutronix.de>
Signed-off-by: Robin Holt <holt(a)sgi.com>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi(a)intel.com>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi(a)gmail.com>
Cc: Suresh Siddha <suresh.b.siddha(a)intel.com>
Cc: Linux Kernel Mailing List <linux-kernel(a)vger.kernel.org>
Cc: x86(a)kernel.org
Cc: Rafael Wysocki <rjw(a)novell.com>

---

arch/x86/include/asm/cacheflush.h | 44 +++++++++++++++++++++-----------------
arch/x86/mm/pat.c | 30 +++++++++----------------
2 files changed, 36 insertions(+), 38 deletions(-)

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Prev: sched: Generate trace points only if scheduler tracing is enabled
Next: [patch 2/2] x86,pat Convert memtype_lock into an rw_lock.