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| author | Paolo Bonzini | 2016-08-31 21:33:58 +0200 |
|---|---|---|
| committer | Paolo Bonzini | 2016-09-27 11:57:30 +0200 |
| commit | c265e976f4669fd65f5b47e6865f50d1cb66bd02 (patch) | |
| tree | b80f5c8500bd6ad92ee0474bce2b4186dd2540c5 /hw/net/virtio-net.c | |
| parent | tcg: Make tb_flush() thread safe (diff) | |
| download | qemu-c265e976f4669fd65f5b47e6865f50d1cb66bd02.tar.gz qemu-c265e976f4669fd65f5b47e6865f50d1cb66bd02.tar.xz qemu-c265e976f4669fd65f5b47e6865f50d1cb66bd02.zip | |
cpus-common: lock-free fast path for cpu_exec_start/end
Set cpu->running without taking the cpu_list lock, only requiring it if
there is a concurrent exclusive section. This requires adding a new
field to CPUState, which records whether a running CPU is being counted
in pending_cpus.
When an exclusive section is started concurrently with cpu_exec_start,
cpu_exec_start can use the new field to determine if it has to wait for
the end of the exclusive section. Likewise, cpu_exec_end can use it to
see if start_exclusive is waiting for that CPU.
This a separate patch for easier bisection of issues.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'hw/net/virtio-net.c')
0 files changed, 0 insertions, 0 deletions