From 402397843e20e35d6cb7c80837c7cfdb19ede591 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Tue, 19 Feb 2013 11:59:09 +0100 Subject: coroutine: move pooling to common code The coroutine pool code is duplicated between the ucontext and sigaltstack backends, and absent from the win32 backend. But the code can be shared easily by moving it to qemu-coroutine.c. Signed-off-by: Paolo Bonzini Reviewed-by: Stefan Hajnoczi Signed-off-by: Kevin Wolf --- qemu-coroutine.c | 45 +++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 43 insertions(+), 2 deletions(-) (limited to 'qemu-coroutine.c') diff --git a/qemu-coroutine.c b/qemu-coroutine.c index 0f6e268574..25a14c605d 100644 --- a/qemu-coroutine.c +++ b/qemu-coroutine.c @@ -17,13 +17,54 @@ #include "block/coroutine.h" #include "block/coroutine_int.h" +enum { + /* Maximum free pool size prevents holding too many freed coroutines */ + POOL_MAX_SIZE = 64, +}; + +/** Free list to speed up creation */ +static QSLIST_HEAD(, Coroutine) pool = QSLIST_HEAD_INITIALIZER(pool); +static unsigned int pool_size; + Coroutine *qemu_coroutine_create(CoroutineEntry *entry) { - Coroutine *co = qemu_coroutine_new(); + Coroutine *co; + + co = QSLIST_FIRST(&pool); + if (co) { + QSLIST_REMOVE_HEAD(&pool, pool_next); + pool_size--; + } else { + co = qemu_coroutine_new(); + } + co->entry = entry; return co; } +static void coroutine_delete(Coroutine *co) +{ + if (pool_size < POOL_MAX_SIZE) { + QSLIST_INSERT_HEAD(&pool, co, pool_next); + co->caller = NULL; + pool_size++; + return; + } + + qemu_coroutine_delete(co); +} + +static void __attribute__((destructor)) coroutine_cleanup(void) +{ + Coroutine *co; + Coroutine *tmp; + + QSLIST_FOREACH_SAFE(co, &pool, pool_next, tmp) { + QSLIST_REMOVE_HEAD(&pool, pool_next); + qemu_coroutine_delete(co); + } +} + static void coroutine_swap(Coroutine *from, Coroutine *to) { CoroutineAction ret; @@ -35,7 +76,7 @@ static void coroutine_swap(Coroutine *from, Coroutine *to) return; case COROUTINE_TERMINATE: trace_qemu_coroutine_terminate(to); - qemu_coroutine_delete(to); + coroutine_delete(to); return; default: abort(); -- cgit v1.2.1