From c796f213a6934712ede728d9b53ef0e5066db23a Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Thu, 16 Dec 2010 14:33:27 -0800 Subject: xen/trace: add multicall tracing Signed-off-by: Jeremy Fitzhardinge --- arch/x86/xen/multicalls.c | 31 +++++++++++++++++++++++-------- 1 file changed, 23 insertions(+), 8 deletions(-) (limited to 'arch/x86/xen/multicalls.c') diff --git a/arch/x86/xen/multicalls.c b/arch/x86/xen/multicalls.c index b9bf19884bc5..7074c7ebfff2 100644 --- a/arch/x86/xen/multicalls.c +++ b/arch/x86/xen/multicalls.c @@ -65,6 +65,8 @@ void xen_mc_flush(void) something in the middle */ local_irq_save(flags); + trace_xen_mc_flush(b->mcidx, b->argidx, b->cbidx); + if (b->mcidx) { #if MC_DEBUG memcpy(b->debug, b->entries, @@ -116,11 +118,15 @@ struct multicall_space __xen_mc_entry(size_t args) struct multicall_space ret; unsigned argidx = roundup(b->argidx, sizeof(u64)); + trace_xen_mc_entry_alloc(args); + BUG_ON(preemptible()); BUG_ON(b->argidx >= MC_ARGS); if (b->mcidx == MC_BATCH || (argidx + args) >= MC_ARGS) { + trace_xen_mc_flush_reason((b->mcidx == MC_BATCH) ? + XEN_MC_FL_BATCH : XEN_MC_FL_ARGS); xen_mc_flush(); argidx = roundup(b->argidx, sizeof(u64)); } @@ -145,20 +151,25 @@ struct multicall_space xen_mc_extend_args(unsigned long op, size_t size) BUG_ON(preemptible()); BUG_ON(b->argidx >= MC_ARGS); - if (b->mcidx == 0) - return ret; - - if (b->entries[b->mcidx - 1].op != op) - return ret; + if (unlikely(b->mcidx == 0 || + b->entries[b->mcidx - 1].op != op)) { + trace_xen_mc_extend_args(op, size, XEN_MC_XE_BAD_OP); + goto out; + } - if ((b->argidx + size) >= MC_ARGS) - return ret; + if (unlikely((b->argidx + size) >= MC_ARGS)) { + trace_xen_mc_extend_args(op, size, XEN_MC_XE_NO_SPACE); + goto out; + } ret.mc = &b->entries[b->mcidx - 1]; ret.args = &b->args[b->argidx]; b->argidx += size; BUG_ON(b->argidx >= MC_ARGS); + + trace_xen_mc_extend_args(op, size, XEN_MC_XE_OK); +out: return ret; } @@ -167,8 +178,12 @@ void xen_mc_callback(void (*fn)(void *), void *data) struct mc_buffer *b = &__get_cpu_var(mc_buffer); struct callback *cb; - if (b->cbidx == MC_BATCH) + if (b->cbidx == MC_BATCH) { + trace_xen_mc_flush_reason(XEN_MC_FL_CALLBACK); xen_mc_flush(); + } + + trace_xen_mc_callback(fn, data); cb = &b->callbacks[b->cbidx++]; cb->fn = fn; -- cgit v1.2.3-55-g7522