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[PULL,v2,09/37] linux-user: enable parallel code generation on clone

Message ID 1477498563-29091-10-git-send-email-rth@twiddle.net
State Accepted
Commit b67cb68ba59fd36076e5961139cb3c953c69bed0
Headers show

Commit Message

Richard Henderson Oct. 26, 2016, 4:15 p.m. UTC 
From: Alex Bennée <alex.bennee@linaro.org>


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 <cota@braap.org>

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

Signed-off-by: Richard Henderson <rth@twiddle.net>

---
 linux-user/syscall.c | 8 ++++++++
 1 file changed, 8 insertions(+)

-- 
2.7.4
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Patch

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.  */