diff options
Diffstat (limited to 'util/qemu-coroutine.c')
| -rw-r--r-- | util/qemu-coroutine.c | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/util/qemu-coroutine.c b/util/qemu-coroutine.c index ea23929a74..4a8bd63ef0 100644 --- a/util/qemu-coroutine.c +++ b/util/qemu-coroutine.c @@ -21,14 +21,20 @@ #include "qemu/coroutine-tls.h" #include "block/aio.h" -/** Initial batch size is 64, and is increased on demand */ +/** + * The minimal batch size is always 64, coroutines from the release_pool are + * reused as soon as there are 64 coroutines in it. The maximum pool size starts + * with 64 and is increased on demand so that coroutines are not deleted even if + * they are not immediately reused. + */ enum { - POOL_INITIAL_BATCH_SIZE = 64, + POOL_MIN_BATCH_SIZE = 64, + POOL_INITIAL_MAX_SIZE = 64, }; /** Free list to speed up creation */ static QSLIST_HEAD(, Coroutine) release_pool = QSLIST_HEAD_INITIALIZER(pool); -static unsigned int pool_batch_size = POOL_INITIAL_BATCH_SIZE; +static unsigned int pool_max_size = POOL_INITIAL_MAX_SIZE; static unsigned int release_pool_size; typedef QSLIST_HEAD(, Coroutine) CoroutineQSList; @@ -57,7 +63,7 @@ Coroutine *qemu_coroutine_create(CoroutineEntry *entry, void *opaque) co = QSLIST_FIRST(alloc_pool); if (!co) { - if (release_pool_size > qatomic_read(&pool_batch_size)) { + if (release_pool_size > POOL_MIN_BATCH_SIZE) { /* Slow path; a good place to register the destructor, too. */ Notifier *notifier = get_ptr_coroutine_pool_cleanup_notifier(); if (!notifier->notify) { @@ -95,12 +101,12 @@ static void coroutine_delete(Coroutine *co) co->caller = NULL; if (CONFIG_COROUTINE_POOL) { - if (release_pool_size < qatomic_read(&pool_batch_size) * 2) { + if (release_pool_size < qatomic_read(&pool_max_size) * 2) { QSLIST_INSERT_HEAD_ATOMIC(&release_pool, co, pool_next); qatomic_inc(&release_pool_size); return; } - if (get_alloc_pool_size() < qatomic_read(&pool_batch_size)) { + if (get_alloc_pool_size() < qatomic_read(&pool_max_size)) { QSLIST_INSERT_HEAD(get_ptr_alloc_pool(), co, pool_next); set_alloc_pool_size(get_alloc_pool_size() + 1); return; @@ -214,10 +220,10 @@ AioContext *coroutine_fn qemu_coroutine_get_aio_context(Coroutine *co) void qemu_coroutine_inc_pool_size(unsigned int additional_pool_size) { - qatomic_add(&pool_batch_size, additional_pool_size); + qatomic_add(&pool_max_size, additional_pool_size); } void qemu_coroutine_dec_pool_size(unsigned int removing_pool_size) { - qatomic_sub(&pool_batch_size, removing_pool_size); + qatomic_sub(&pool_max_size, removing_pool_size); } |