diff options
| author | Lluís Vilanova | 2017-07-04 10:42:32 +0200 |
|---|---|---|
| committer | Stefan Hajnoczi | 2017-07-17 14:11:05 +0200 |
| commit | 61a67f71dd7e437212a2730c4462dff9b3b7b3da (patch) | |
| tree | f2f6baa00f0b9c9c6cd0c02fb5b184c0590e6bea /include/exec/tb-hash.h | |
| parent | trace: [tcg] Delay changes to dynamic state when translating (diff) | |
| download | qemu-61a67f71dd7e437212a2730c4462dff9b3b7b3da.tar.gz qemu-61a67f71dd7e437212a2730c4462dff9b3b7b3da.tar.xz qemu-61a67f71dd7e437212a2730c4462dff9b3b7b3da.zip | |
exec: [tcg] Use different TBs according to the vCPU's dynamic tracing state
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 <vilanova@ac.upc.edu>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Reviewed-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-id: 149915775266.6295.10060144081246467690.stgit@frigg.lan
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'include/exec/tb-hash.h')
| -rw-r--r-- | include/exec/tb-hash.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/include/exec/tb-hash.h b/include/exec/tb-hash.h index b1fe2d0161..17b5ee0edf 100644 --- a/include/exec/tb-hash.h +++ b/include/exec/tb-hash.h @@ -58,9 +58,10 @@ static inline unsigned int tb_jmp_cache_hash_func(target_ulong pc) #endif /* CONFIG_SOFTMMU */ static inline -uint32_t tb_hash_func(tb_page_addr_t phys_pc, target_ulong pc, uint32_t flags) +uint32_t tb_hash_func(tb_page_addr_t phys_pc, target_ulong pc, uint32_t flags, + uint32_t trace_vcpu_dstate) { - return tb_hash_func5(phys_pc, pc, flags); + return tb_hash_func6(phys_pc, pc, flags, trace_vcpu_dstate); } #endif |