[Qemu-devel] [RFC PATCH 11/14] block: report RCU quiescent states

[Mike Day <ncmike@ncultra.org>]

From: Paolo Bonzini <pbonzini@redhat.com>

The aio workers may spend a long time executing I/O operations;
mark that time as an extended quiescent state.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Mike Day <ncmike@ncultra.org>
---
 block/raw-posix.c | 3 +++
 block/raw-win32.c | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/block/raw-posix.c b/block/raw-posix.c
index ba721d3..962833e 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -26,6 +26,7 @@
 #include "qemu/log.h"
 #include "block/block_int.h"
 #include "qemu/module.h"
+#include "qemu/rcu.h"
 #include "trace.h"
 #include "block/thread-pool.h"
 #include "qemu/iov.h"
@@ -735,6 +736,7 @@ static int aio_worker(void *arg)
     RawPosixAIOData *aiocb = arg;
     ssize_t ret = 0;
 
+    rcu_thread_offline();
     switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) {
     case QEMU_AIO_READ:
         ret = handle_aiocb_rw(aiocb);
@@ -774,6 +776,7 @@ static int aio_worker(void *arg)
     }
 
     g_slice_free(RawPosixAIOData, aiocb);
+    rcu_thread_online();
     return ret;
 }
 
diff --git a/block/raw-win32.c b/block/raw-win32.c
index 9b5b2af..5f88452 100644
--- a/block/raw-win32.c
+++ b/block/raw-win32.c
@@ -25,6 +25,7 @@
 #include "qemu/timer.h"
 #include "block/block_int.h"
 #include "qemu/module.h"
+#include "qemu/rcu.h"
 #include "raw-aio.h"
 #include "trace.h"
 #include "block/thread-pool.h"
@@ -99,6 +100,7 @@ static int aio_worker(void *arg)
     ssize_t ret = 0;
     size_t count;
 
+    rcu_thread_offline();
     switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) {
     case QEMU_AIO_READ:
         count = handle_aiocb_rw(aiocb);
@@ -136,6 +138,7 @@ static int aio_worker(void *arg)
     }
 
     g_slice_free(RawWin32AIOData, aiocb);
+    rcu_thread_online();
     return ret;
 }
 
-- 
1.8.3.1