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[Qemu-devel] [PULL v2 09/37] linux-user: enable parallel code generation
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PULL v2 09/37] linux-user: enable parallel code generation on clone |
Date: |
Wed, 26 Oct 2016 09:15:35 -0700 |
From: Alex Bennée <address@hidden>
The variable parallel_cpus controls the generation of thread aware
atomic code. We only need to set it once we clone our first thread.
At this point any existing translations need to be thrown away.
Reviewed-by: Emilio G. Cota <address@hidden>
Signed-off-by: Alex Bennée <address@hidden>
Signed-off-by: Richard Henderson <address@hidden>
---
linux-user/syscall.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index db697c0..7b77503 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -6164,6 +6164,14 @@ static int do_fork(CPUArchState *env, unsigned int
flags, abi_ulong newsp,
sigfillset(&sigmask);
sigprocmask(SIG_BLOCK, &sigmask, &info.sigmask);
+ /* If this is our first additional thread, we need to ensure we
+ * generate code for parallel execution and flush old translations.
+ */
+ if (!parallel_cpus) {
+ parallel_cpus = true;
+ tb_flush(cpu);
+ }
+
ret = pthread_create(&info.thread, &attr, clone_func, &info);
/* TODO: Free new CPU state if thread creation failed. */
--
2.7.4
- [Qemu-devel] [PULL v2 00/37] cmpxchg atomic operations, Richard Henderson, 2016/10/26
- [Qemu-devel] [PULL v2 03/37] atomics: add atomic_op_fetch variants, Richard Henderson, 2016/10/26
- [Qemu-devel] [PULL v2 02/37] atomics: add atomic_xor, Richard Henderson, 2016/10/26
- [Qemu-devel] [PULL v2 01/37] atomics: Add parameters to macros, Richard Henderson, 2016/10/26
- [Qemu-devel] [PULL v2 04/37] atomics: Add __nocheck atomic operations, Richard Henderson, 2016/10/26
- [Qemu-devel] [PULL v2 09/37] linux-user: enable parallel code generation on clone,
Richard Henderson <=
- [Qemu-devel] [PULL v2 07/37] int128: Add int128_make128, Richard Henderson, 2016/10/26
- [Qemu-devel] [PULL v2 05/37] exec: Avoid direct references to Int128 parts, Richard Henderson, 2016/10/26
- [Qemu-devel] [PULL v2 06/37] int128: Use __int128 if available, Richard Henderson, 2016/10/26
- [Qemu-devel] [PULL v2 10/37] cputlb: Replace SHIFT with DATA_SIZE, Richard Henderson, 2016/10/26
- [Qemu-devel] [PULL v2 14/37] cputlb: Tidy some macros, Richard Henderson, 2016/10/26
- [Qemu-devel] [PULL v2 12/37] cputlb: Remove includes from softmmu_template.h, Richard Henderson, 2016/10/26
- [Qemu-devel] [PULL v2 13/37] cputlb: Move most of iotlb code out of line, Richard Henderson, 2016/10/26
- [Qemu-devel] [PULL v2 11/37] cputlb: Move probe_write out of softmmu_template.h, Richard Henderson, 2016/10/26
- [Qemu-devel] [PULL v2 18/37] tcg: Emit barriers with parallel_cpus, Richard Henderson, 2016/10/26
- [Qemu-devel] [PULL v2 17/37] tcg: Add CONFIG_ATOMIC64, Richard Henderson, 2016/10/26