MFP4:

- Implement sampling modes and logging support in hwpmc(4).

- Separate MI and MD parts of hwpmc(4) and allow sharing of
  PMC implementations across different architectures.
  Add support for P4 (EMT64) style PMCs to the amd64 code.

- New pmcstat(8) options: -E (exit time counts) -W (counts
  every context switch), -R (print log file).

- pmc(3) API changes, improve our ability to keep ABI compatibility
  in the future.  Add more 'alias' names for commonly used events.

- bug fixes & documentation.

1 files changed, 8 insertions, 1 deletions

diff --git a/sys/kern/kern_pmc.c b/sys/kern/kern_pmc.c
index ee0f8ec..43059cc 100644
--- a/sys/kern/kern_pmc.c
+++ b/sys/kern/kern_pmc.c
@@ -37,7 +37,14 @@ int (*pmc_hook)(struct thread *td, int function, void *arg) = NULL;
 /* Interrupt handler */
 int (*pmc_intr)(int cpu, uintptr_t pc, int usermode) = NULL;
 
-cpumask_t pmc_cpumask;
+volatile cpumask_t pmc_cpumask;
+
+/*
+ * A global count of SS mode PMCs.  When non-zero, this means that
+ * we have processes that are sampling the system as a whole.
+ */
+
+volatile int pmc_ss_count;
 
 /*
  * Since PMC(4) may not be loaded in the current kernel, the