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| author | Stephane Eranian <eranian@hpl.hp.com> | 2007-05-02 13:27:05 -0400 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2007-05-02 13:27:05 -0400 |
| commit | bf8696ed6dfa561198b4736deaf11ab68dcc4845 (patch) | |
| tree | 54409e3dd141d468ab0f0c611ebb32f1d67af817 /drivers/dma/ioatdma_hw.h | |
| parent | 803d80f65038f77c4681a0d7708e9d693e68aaa8 (diff) | |
[PATCH] i386: i386 make NMI use PERFCTR1 for architectural perfmon (take 2)
Hello,
This patch against 2.6.20-git14 makes the NMI watchdog use PERFSEL1/PERFCTR1
instead of PERFSEL0/PERFCTR0 on processors supporting Intel architectural
perfmon, such as Intel Core 2. Although all PMU events can work on
both counters, the Precise Event-Based Sampling (PEBS) requires that the
event be in PERFCTR0 to work correctly (see section 18.14.4.1 in the
IA32 SDM Vol 3b).
A similar patch for x86-64 is to follow.
Changelog:
- make the i386 NMI watchdog use PERFSEL1/PERFCTR1 instead of PERFSEL0/PERFCTR0
on processors supporting the Intel architectural perfmon (e.g. Core 2 Duo).
This allows PEBS to work when the NMI watchdog is active.
signed-off-by: stephane eranian <eranian@hpl.hp.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'drivers/dma/ioatdma_hw.h')
0 files changed, 0 insertions, 0 deletions