From 675fd4eecd75a7156c83bb814ecfdbbcfbf27ea1 Mon Sep 17 00:00:00 2001 From: Samuel Thibault Date: Wed, 20 Apr 2016 00:32:15 +0200 Subject: Add kernel profiling through sampling * NEWS: Advertise feature. * configfrac.ac (--enable-kernsample): Add option. * kern/pc_sample.h (take_pc_sample): Add usermode and pc parameter. (take_pc_sample_macro): Take usermode and pc parameters, pass as such to take_pc_sample. * kern/pc_sample.c (take_pc_sample): Use pc parameter when usermode is 1. * kern/mach_clock.c (clock_interrupt): Add pc parameter. Pass usermode and pc to take_pc_sample_macro call. * i386/i386/hardclock.c (hardclock): Pass regs->eip to clock_interrupt call on normal interrupts, NULL on interrupt interrupt. * vm/vm_fault.c (vm_fault_cleanup): Set usermode to 1 and pc to NULL in take_pc_sample_macro call. --- kern/pc_sample.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) (limited to 'kern/pc_sample.c') diff --git a/kern/pc_sample.c b/kern/pc_sample.c index fcb9d71b..e9f0b16a 100644 --- a/kern/pc_sample.c +++ b/kern/pc_sample.c @@ -46,12 +46,18 @@ typedef sampled_pc_t sampled_pcs[MAX_PC_SAMPLES]; void take_pc_sample( const thread_t t, sample_control_t *cp, - sampled_pc_flavor_t flavor) + sampled_pc_flavor_t flavor, + boolean_t usermode, + vm_offset_t kern_pc) { vm_offset_t pc; struct sampled_pc *sample; - pc = interrupted_pc(t); + if (usermode) + pc = interrupted_pc(t); + else + pc = kern_pc; + cp->seqno++; sample = &((sampled_pc_t *)cp->buffer)[cp->seqno % MAX_PC_SAMPLES]; sample->id = (vm_offset_t)t; -- cgit v1.2.3