From 61a67f71dd7e437212a2730c4462dff9b3b7b3da Mon Sep 17 00:00:00 2001 From: Lluís Vilanova Date: Tue, 4 Jul 2017 10:42:32 +0200 Subject: exec: [tcg] Use different TBs according to the vCPU's dynamic tracing state MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Every vCPU now uses a separate set of TBs for each set of dynamic tracing event state values. Each set of TBs can be used by any number of vCPUs to maximize TB reuse when vCPUs have the same tracing state. This feature is later used by tracetool to optimize tracing of guest code events. The maximum number of TB sets is defined as 2^E, where E is the number of events that have the 'vcpu' property (their state is stored in CPUState->trace_dstate). For this to work, a change on the dynamic tracing state of a vCPU will force it to flush its virtual TB cache (which is only indexed by address), and fall back to the physical TB cache (which now contains the vCPU's dynamic tracing state as part of the hashing function). Signed-off-by: Lluís Vilanova Reviewed-by: Richard Henderson Reviewed-by: Emilio G. Cota Signed-off-by: Emilio G. Cota Message-id: 149915775266.6295.10060144081246467690.stgit@frigg.lan Signed-off-by: Stefan Hajnoczi --- include/exec/exec-all.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include/exec/exec-all.h') diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h index bf8da2aa5a..c09b365716 100644 --- a/include/exec/exec-all.h +++ b/include/exec/exec-all.h @@ -330,6 +330,9 @@ struct TranslationBlock { #define CF_USE_ICOUNT 0x20000 #define CF_IGNORE_ICOUNT 0x40000 /* Do not generate icount code */ + /* Per-vCPU dynamic tracing state used to generate this TB */ + uint32_t trace_vcpu_dstate; + uint16_t invalid; void *tc_ptr; /* pointer to the translated code */ -- cgit 1.4.1