From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:46287) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bBNOp-0003eX-5u for qemu-devel@nongnu.org; Fri, 10 Jun 2016 10:27:04 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bBNOj-0005gF-TU for qemu-devel@nongnu.org; Fri, 10 Jun 2016 10:27:02 -0400 Received: from mail-pf0-x241.google.com ([2607:f8b0:400e:c00::241]:34847) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bBNOj-0005fu-J4 for qemu-devel@nongnu.org; Fri, 10 Jun 2016 10:26:57 -0400 Received: by mail-pf0-x241.google.com with SMTP id t190so5238213pfb.2 for ; Fri, 10 Jun 2016 07:26:57 -0700 (PDT) Sender: Richard Henderson From: Richard Henderson Date: Fri, 10 Jun 2016 07:26:41 -0700 Message-Id: <1465568813-19771-4-git-send-email-rth@twiddle.net> In-Reply-To: <1465568813-19771-1-git-send-email-rth@twiddle.net> References: <1465568813-19771-1-git-send-email-rth@twiddle.net> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Subject: [Qemu-devel] [PULL 03/15] seqlock: rename write_lock/unlock to write_begin/end List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: peter.maydell@linaro.org, "Emilio G. Cota" From: "Emilio G. Cota" It is a more appropriate name, now that the mutex embedded in the seqlock is gone. Reviewed-by: Sergey Fedorov Reviewed-by: Alex Bennée Reviewed-by: Richard Henderson Signed-off-by: Emilio G. Cota Message-Id: <1465412133-3029-4-git-send-email-cota@braap.org> Signed-off-by: Richard Henderson --- cpus.c | 28 ++++++++++++++-------------- include/qemu/seqlock.h | 4 ++-- 2 files changed, 16 insertions(+), 16 deletions(-) diff --git a/cpus.c b/cpus.c index 1c92362..84c3520 100644 --- a/cpus.c +++ b/cpus.c @@ -249,13 +249,13 @@ int64_t cpu_get_clock(void) void cpu_enable_ticks(void) { /* Here, the really thing protected by seqlock is cpu_clock_offset. */ - seqlock_write_lock(&timers_state.vm_clock_seqlock); + seqlock_write_begin(&timers_state.vm_clock_seqlock); if (!timers_state.cpu_ticks_enabled) { timers_state.cpu_ticks_offset -= cpu_get_host_ticks(); timers_state.cpu_clock_offset -= get_clock(); timers_state.cpu_ticks_enabled = 1; } - seqlock_write_unlock(&timers_state.vm_clock_seqlock); + seqlock_write_end(&timers_state.vm_clock_seqlock); } /* disable cpu_get_ticks() : the clock is stopped. You must not call @@ -265,13 +265,13 @@ void cpu_enable_ticks(void) void cpu_disable_ticks(void) { /* Here, the really thing protected by seqlock is cpu_clock_offset. */ - seqlock_write_lock(&timers_state.vm_clock_seqlock); + seqlock_write_begin(&timers_state.vm_clock_seqlock); if (timers_state.cpu_ticks_enabled) { timers_state.cpu_ticks_offset += cpu_get_host_ticks(); timers_state.cpu_clock_offset = cpu_get_clock_locked(); timers_state.cpu_ticks_enabled = 0; } - seqlock_write_unlock(&timers_state.vm_clock_seqlock); + seqlock_write_end(&timers_state.vm_clock_seqlock); } /* Correlation between real and virtual time is always going to be @@ -294,7 +294,7 @@ static void icount_adjust(void) return; } - seqlock_write_lock(&timers_state.vm_clock_seqlock); + seqlock_write_begin(&timers_state.vm_clock_seqlock); cur_time = cpu_get_clock_locked(); cur_icount = cpu_get_icount_locked(); @@ -315,7 +315,7 @@ static void icount_adjust(void) last_delta = delta; timers_state.qemu_icount_bias = cur_icount - (timers_state.qemu_icount << icount_time_shift); - seqlock_write_unlock(&timers_state.vm_clock_seqlock); + seqlock_write_end(&timers_state.vm_clock_seqlock); } static void icount_adjust_rt(void *opaque) @@ -355,7 +355,7 @@ static void icount_warp_rt(void) return; } - seqlock_write_lock(&timers_state.vm_clock_seqlock); + seqlock_write_begin(&timers_state.vm_clock_seqlock); if (runstate_is_running()) { int64_t clock = REPLAY_CLOCK(REPLAY_CLOCK_VIRTUAL_RT, cpu_get_clock_locked()); @@ -374,7 +374,7 @@ static void icount_warp_rt(void) timers_state.qemu_icount_bias += warp_delta; } vm_clock_warp_start = -1; - seqlock_write_unlock(&timers_state.vm_clock_seqlock); + seqlock_write_end(&timers_state.vm_clock_seqlock); if (qemu_clock_expired(QEMU_CLOCK_VIRTUAL)) { qemu_clock_notify(QEMU_CLOCK_VIRTUAL); @@ -399,9 +399,9 @@ void qtest_clock_warp(int64_t dest) int64_t deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL); int64_t warp = qemu_soonest_timeout(dest - clock, deadline); - seqlock_write_lock(&timers_state.vm_clock_seqlock); + seqlock_write_begin(&timers_state.vm_clock_seqlock); timers_state.qemu_icount_bias += warp; - seqlock_write_unlock(&timers_state.vm_clock_seqlock); + seqlock_write_end(&timers_state.vm_clock_seqlock); qemu_clock_run_timers(QEMU_CLOCK_VIRTUAL); timerlist_run_timers(aio_context->tlg.tl[QEMU_CLOCK_VIRTUAL]); @@ -468,9 +468,9 @@ void qemu_start_warp_timer(void) * It is useful when we want a deterministic execution time, * isolated from host latencies. */ - seqlock_write_lock(&timers_state.vm_clock_seqlock); + seqlock_write_begin(&timers_state.vm_clock_seqlock); timers_state.qemu_icount_bias += deadline; - seqlock_write_unlock(&timers_state.vm_clock_seqlock); + seqlock_write_end(&timers_state.vm_clock_seqlock); qemu_clock_notify(QEMU_CLOCK_VIRTUAL); } else { /* @@ -481,11 +481,11 @@ void qemu_start_warp_timer(void) * you will not be sending network packets continuously instead of * every 100ms. */ - seqlock_write_lock(&timers_state.vm_clock_seqlock); + seqlock_write_begin(&timers_state.vm_clock_seqlock); if (vm_clock_warp_start == -1 || vm_clock_warp_start > clock) { vm_clock_warp_start = clock; } - seqlock_write_unlock(&timers_state.vm_clock_seqlock); + seqlock_write_end(&timers_state.vm_clock_seqlock); timer_mod_anticipate(icount_warp_timer, clock + deadline); } } else if (deadline == 0) { diff --git a/include/qemu/seqlock.h b/include/qemu/seqlock.h index e673482..4dfc055 100644 --- a/include/qemu/seqlock.h +++ b/include/qemu/seqlock.h @@ -28,7 +28,7 @@ static inline void seqlock_init(QemuSeqLock *sl) } /* Lock out other writers and update the count. */ -static inline void seqlock_write_lock(QemuSeqLock *sl) +static inline void seqlock_write_begin(QemuSeqLock *sl) { ++sl->sequence; @@ -36,7 +36,7 @@ static inline void seqlock_write_lock(QemuSeqLock *sl) smp_wmb(); } -static inline void seqlock_write_unlock(QemuSeqLock *sl) +static inline void seqlock_write_end(QemuSeqLock *sl) { /* Write other fields before finalizing sequence. */ smp_wmb(); -- 2.5.5