avg 864edd8840 hwpmc: fix a race between amd_stop_pmc and amd_intr ... It is possible that wrmsr in amd_stop_pmc() causes an overflow in a counter that it disables. In that case a non-maskable interrupt is generated. The interrupt handler code was written in such a way that it would re-enable the counter. That would lead to an unexpected interrupt later on. This problem was easy to reproduce with $ pmcstat -T -P instructions -t $pid if the target process is sufficiently busy and there are context switches from time to time. There would be a lot of interrupts to "race" with amd_stop_pmc() called during the context switches. The problem affected only AMD processors. While there, trace whether amd_intr() claimed an interrupt. Reviewed by: jhb MFC after: 2 weeks		2016-10-30 09:38:10 +00:00
..
hwpmc_amd.c	hwpmc: fix a race between amd_stop_pmc and amd_intr	2016-10-30 09:38:10 +00:00
hwpmc_amd.h
hwpmc_arm64_md.c
hwpmc_arm64.c
hwpmc_arm64.h
hwpmc_arm.c
hwpmc_armv7.c
hwpmc_armv7.h
hwpmc_core.c	Apply the fix from r232612 to fixed function counters.	2016-08-03 16:52:00 +00:00
hwpmc_core.h
hwpmc_e500.c
hwpmc_intel.c
hwpmc_logging.c	hwpmc: remove sys/capability.h backwards compatibility	2016-09-20 12:56:03 +00:00
hwpmc_mips24k.c
hwpmc_mips74k.c
hwpmc_mips.c
hwpmc_mod.c	Don't panic in hwpmc when stopping sampling.	2016-05-28 13:05:39 +00:00
hwpmc_mpc7xxx.c
hwpmc_octeon.c
hwpmc_pentium.c
hwpmc_pentium.h
hwpmc_piv.c	Remove misc NULL checks after M_WAITOK allocations.	2016-05-10 10:26:07 +00:00
hwpmc_piv.h
hwpmc_powerpc.c
hwpmc_powerpc.h
hwpmc_ppc970.c
hwpmc_ppro.c
hwpmc_ppro.h
hwpmc_riscv.h
hwpmc_soft.c
hwpmc_soft.h
hwpmc_sparc64.c
hwpmc_tsc.c
hwpmc_tsc.h
hwpmc_uncore.c
hwpmc_uncore.h
hwpmc_x86.c
hwpmc_xscale.c
hwpmc_xscale.h
pmc_events.h