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[Qemu-devel] [PULL 15/17] icount: document (future) locking rules for ic
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PULL 15/17] icount: document (future) locking rules for icount |
Date: |
Thu, 17 Oct 2013 17:48:53 +0200 |
Reviewed-by: Alex Bligh <address@hidden>
Signed-off-by: Paolo Bonzini <address@hidden>
---
cpus.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/cpus.c b/cpus.c
index 34d5e04..6203d98 100644
--- a/cpus.c
+++ b/cpus.c
@@ -98,17 +98,22 @@ static bool all_cpu_threads_idle(void)
/***********************************************************/
/* guest cycle counter */
+/* Protected by TimersState seqlock */
+
+/* Compensate for varying guest execution speed. */
+static int64_t qemu_icount_bias;
+static int64_t vm_clock_warp_start;
/* Conversion factor from emulated instructions to virtual clock ticks. */
static int icount_time_shift;
/* Arbitrarily pick 1MIPS as the minimum allowable speed. */
#define MAX_ICOUNT_SHIFT 10
-/* Compensate for varying guest execution speed. */
-static int64_t qemu_icount_bias;
+
+/* Only written by TCG thread */
+static int64_t qemu_icount;
+
static QEMUTimer *icount_rt_timer;
static QEMUTimer *icount_vm_timer;
static QEMUTimer *icount_warp_timer;
-static int64_t vm_clock_warp_start;
-static int64_t qemu_icount;
typedef struct TimersState {
/* Protected by BQL. */
@@ -235,6 +240,8 @@ static void icount_adjust(void)
int64_t cur_time;
int64_t cur_icount;
int64_t delta;
+
+ /* Protected by TimersState mutex. */
static int64_t last_delta;
/* If the VM is not running, then do nothing. */
--
1.8.3.1
- [Qemu-devel] [PULL 04/17] cirrus: Mark vga io region as coalesced MMIO flushing, (continued)
- [Qemu-devel] [PULL 04/17] cirrus: Mark vga io region as coalesced MMIO flushing, Paolo Bonzini, 2013/10/17
- [Qemu-devel] [PULL 05/17] vga: Mark relevant portio lists regions as coalesced MMIO flushing, Paolo Bonzini, 2013/10/17
- [Qemu-devel] [PULL 03/17] portio: Allow to mark portio lists as coalesced MMIO flushing, Paolo Bonzini, 2013/10/17
- [Qemu-devel] [PULL 10/17] timer: extract timer_mod_ns_locked and timerlist_rearm, Paolo Bonzini, 2013/10/17
- [Qemu-devel] [PULL 11/17] timer: add timer_mod_anticipate and timer_mod_anticipate_ns, Paolo Bonzini, 2013/10/17
- [Qemu-devel] [PULL 07/17] timer: protect timers_state's clock with seqlock, Paolo Bonzini, 2013/10/17
- [Qemu-devel] [PULL 06/17] seqlock: introduce read-write seqlock, Paolo Bonzini, 2013/10/17
- [Qemu-devel] [PULL 08/17] qemu-thread: add QemuEvent, Paolo Bonzini, 2013/10/17
- [Qemu-devel] [PULL 12/17] icount: use cpu_get_icount() directly, Paolo Bonzini, 2013/10/17
- [Qemu-devel] [PULL 09/17] timer: make qemu_clock_enable sync between disable and timer's cb, Paolo Bonzini, 2013/10/17
- [Qemu-devel] [PULL 15/17] icount: document (future) locking rules for icount,
Paolo Bonzini <=
- [Qemu-devel] [PULL 13/17] icount: reorganize icount_warp_rt, Paolo Bonzini, 2013/10/17
- [Qemu-devel] [PULL 14/17] icount: prepare the code for future races in calling qemu_clock_warp, Paolo Bonzini, 2013/10/17
- [Qemu-devel] [PULL 16/17] icount: make it thread-safe, Paolo Bonzini, 2013/10/17
- [Qemu-devel] [PULL 17/17] exec: remove qemu_safe_ram_ptr, Paolo Bonzini, 2013/10/17