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[Qemu-devel] [PATCH v7 07/35] linux-user: enable parallel code generatio
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PATCH v7 07/35] linux-user: enable parallel code generation on clone |
Date: |
Wed, 19 Oct 2016 10:21:39 -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 03339ba..52740b7 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -6144,6 +6144,14 @@ 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] [PATCH v7 00/35] cmpxchg-based emulation of atomics, Richard Henderson, 2016/10/19
- [Qemu-devel] [PATCH v7 01/35] atomics: add atomic_xor, Richard Henderson, 2016/10/19
- [Qemu-devel] [PATCH v7 03/35] exec: Avoid direct references to Int128 parts, Richard Henderson, 2016/10/19
- [Qemu-devel] [PATCH v7 02/35] atomics: add atomic_op_fetch variants, Richard Henderson, 2016/10/19
- [Qemu-devel] [PATCH v7 04/35] int128: Use __int128 if available, Richard Henderson, 2016/10/19
- [Qemu-devel] [PATCH v7 05/35] int128: Add int128_make128, Richard Henderson, 2016/10/19
- [Qemu-devel] [PATCH v7 07/35] linux-user: enable parallel code generation on clone,
Richard Henderson <=
- [Qemu-devel] [PATCH v7 10/35] cputlb: Remove includes from softmmu_template.h, Richard Henderson, 2016/10/19
- [Qemu-devel] [PATCH v7 09/35] cputlb: Move probe_write out of softmmu_template.h, Richard Henderson, 2016/10/19
- [Qemu-devel] [PATCH v7 08/35] cputlb: Replace SHIFT with DATA_SIZE, Richard Henderson, 2016/10/19
- [Qemu-devel] [PATCH v7 11/35] cputlb: Move most of iotlb code out of line, Richard Henderson, 2016/10/19
- [Qemu-devel] [PATCH v7 12/35] cputlb: Tidy some macros, Richard Henderson, 2016/10/19
- [Qemu-devel] [PATCH v7 16/35] tcg: Emit barriers with parallel_cpus, Richard Henderson, 2016/10/19
- [Qemu-devel] [PATCH v7 15/35] tcg: Add CONFIG_ATOMIC64, Richard Henderson, 2016/10/19
- [Qemu-devel] [PATCH v7 14/35] tcg: Add atomic128 helpers, Richard Henderson, 2016/10/19
- [Qemu-devel] [PATCH v7 18/35] target-i386: emulate LOCK'ed OP instructions using atomic helpers, Richard Henderson, 2016/10/19
- [Qemu-devel] [PATCH v7 19/35] target-i386: emulate LOCK'ed INC using atomic helper, Richard Henderson, 2016/10/19