From: Stephane Eranian Date: Wed, 2 May 2007 17:27:05 +0000 (+0200) Subject: [PATCH] i386: i386 make NMI use PERFCTR1 for architectural perfmon (take 2) X-Git-Tag: v2.6.22-rc1~1011^2~208 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bf8696ed6dfa561198b4736deaf11ab68dcc4845;p=pandora-kernel.git [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 Signed-off-by: Andi Kleen --- Reading git-diff-tree failed