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authorPeter Maydell <peter.maydell@linaro.org>2018-06-04 18:34:04 +0100
committerPeter Maydell <peter.maydell@linaro.org>2018-06-04 18:34:04 +0100
commit0d514fa23402ab7b4f1c965e0631d953bbe4d3b7 (patch)
tree15694d41fba306b5b8e545d9a6e15bb199c64b25 /util
parent5d7ad3ce103af3ab7c860a4ca97653f8ffa6e29c (diff)
parent21891a5a3011608845b5d7f1f9cce60cdc2bcc62 (diff)
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Merge remote-tracking branch 'remotes/stefanha/tags/block-pull-request' into staging
Pull request * Copy offloading for qemu-img convert (iSCSI, raw, and qcow2) If the underlying storage supports copy offloading, qemu-img convert will use it instead of performing reads and writes. This avoids data transfers and thus frees up storage bandwidth for other purposes. SCSI EXTENDED COPY and Linux copy_file_range(2) are used to implement this optimization. * Drop spurious "WARNING: I\/O thread spun for 1000 iterations" warning # gpg: Signature made Mon 04 Jun 2018 12:20:08 BST # gpg: using RSA key 9CA4ABB381AB73C8 # gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>" # gpg: aka "Stefan Hajnoczi <stefanha@gmail.com>" # Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35 775A 9CA4 ABB3 81AB 73C8 * remotes/stefanha/tags/block-pull-request: main-loop: drop spin_counter qemu-img: Convert with copy offloading block-backend: Add blk_co_copy_range iscsi: Implement copy offloading iscsi: Create and use iscsi_co_wait_for_task iscsi: Query and save device designator when opening file-posix: Implement bdrv_co_copy_range qcow2: Implement copy offloading raw: Implement copy offloading raw: Check byte range uniformly block: Introduce API for copy offloading Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'util')
-rw-r--r--util/main-loop.c25
1 files changed, 0 insertions, 25 deletions
diff --git a/util/main-loop.c b/util/main-loop.c
index 992f9b0..affe040 100644
--- a/util/main-loop.c
+++ b/util/main-loop.c
@@ -222,36 +222,11 @@ static int os_host_main_loop_wait(int64_t timeout)
{
GMainContext *context = g_main_context_default();
int ret;
- static int spin_counter;
g_main_context_acquire(context);
glib_pollfds_fill(&timeout);
- /* If the I/O thread is very busy or we are incorrectly busy waiting in
- * the I/O thread, this can lead to starvation of the BQL such that the
- * VCPU threads never run. To make sure we can detect the later case,
- * print a message to the screen. If we run into this condition, create
- * a fake timeout in order to give the VCPU threads a chance to run.
- */
- if (!timeout && (spin_counter > MAX_MAIN_LOOP_SPIN)) {
- static bool notified;
-
- if (!notified && !qtest_enabled() && !qtest_driver()) {
- warn_report("I/O thread spun for %d iterations",
- MAX_MAIN_LOOP_SPIN);
- notified = true;
- }
-
- timeout = SCALE_MS;
- }
-
-
- if (timeout) {
- spin_counter = 0;
- } else {
- spin_counter++;
- }
qemu_mutex_unlock_iothread();
replay_mutex_unlock();