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From: | Alex Bennée |
Subject: | Re: [Qemu-devel] [RFC PATCH V7 09/19] Drop global lock during TCG code execution |
Date: | Tue, 11 Aug 2015 21:12:41 +0100 |
Paolo Bonzini <address@hidden> writes: > On 10/08/2015 17:27, address@hidden wrote: >> void qemu_mutex_lock_iothread(void) >> { >> - atomic_inc(&iothread_requesting_mutex); >> - /* In the simple case there is no need to bump the VCPU thread out of >> - * TCG code execution. >> - */ >> - if (!tcg_enabled() || qemu_in_vcpu_thread() || >> - !first_cpu || !first_cpu->thread) { >> - qemu_mutex_lock(&qemu_global_mutex); >> - atomic_dec(&iothread_requesting_mutex); >> - } else { >> - if (qemu_mutex_trylock(&qemu_global_mutex)) { >> - qemu_cpu_kick_thread(first_cpu); >> - qemu_mutex_lock(&qemu_global_mutex); >> - } >> - atomic_dec(&iothread_requesting_mutex); >> - qemu_cond_broadcast(&qemu_io_proceeded_cond); >> - } >> - iothread_locked = true; > > "iothread_locked = true" must be kept. Otherwise... yay! :) > Also if qemu_cond_broadcast(&qemu_io_proceeded_cond) is being dropped there is no point keeping the guff around in qemu_tcg_wait_io_event. -- Alex Bennée
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