Again, no need to loop if less than a full buffer is read, the next
read would return EAGAIN.
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
qemu-kvm.c | 16 +++++-----------
1 files changed, 5 insertions(+), 11 deletions(-)
diff --git a/qemu-kvm.c b/qemu-kvm.c
index 669a784..50e1303 100644
--- a/qemu-kvm.c
+++ b/qemu-kvm.c
@@ -2049,19 +2049,13 @@ static void sigfd_handler(void *opaque)
static void io_thread_wakeup(void *opaque)
{
int fd = (unsigned long) opaque;
- char buffer[4096];
-
- /* Drain the pipe/(eventfd) */
- while (1) {
- ssize_t len;
+ ssize_t len;
+ char buffer[512];
+ /* Drain the notify pipe. For eventfd, only 8 bytes will be read. */
+ do {
len = read(fd, buffer, sizeof(buffer));
- if (len == -1 && errno == EINTR)
- continue;
-
- if (len <= 0)
- break;
- }
+ } while ((len == -1 && errno == EINTR) || len == sizeof(buffer));
}
int kvm_main_loop(void)
--
1.6.6
--
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