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[Qemu-devel] [PATCH 13/13] trace: trace bdrv_aio_readv/writev error path
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [PATCH 13/13] trace: trace bdrv_aio_readv/writev error paths |
Date: |
Tue, 14 Jun 2011 19:18:31 +0100 |
It is useful to understand why an I/O request was failed. Add trace
events for the error paths in bdrv_aio_readv() and bdrv_aio_writev().
Signed-off-by: Stefan Hajnoczi <address@hidden>
---
block.c | 24 +++++++++++++++++++-----
trace-events | 7 +++++++
2 files changed, 26 insertions(+), 5 deletions(-)
diff --git a/block.c b/block.c
index 4da35be..816edd6 100644
--- a/block.c
+++ b/block.c
@@ -2129,10 +2129,14 @@ BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs,
int64_t sector_num,
trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque);
- if (!drv)
+ if (!drv) {
+ trace_bdrv_aio_readv_null_drv(bs, sector_num, nb_sectors, opaque);
return NULL;
- if (bdrv_check_request(bs, sector_num, nb_sectors))
+ }
+ if (bdrv_check_request(bs, sector_num, nb_sectors)) {
+ trace_bdrv_aio_readv_out_of_range(bs, sector_num, nb_sectors, opaque);
return NULL;
+ }
ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors,
cb, opaque);
@@ -2141,6 +2145,8 @@ BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs,
int64_t sector_num,
/* Update stats even though technically transfer has not happened. */
bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
bs->rd_ops ++;
+ } else {
+ trace_bdrv_aio_readv_failed(bs, sector_num, nb_sectors, opaque);
}
return ret;
@@ -2192,12 +2198,18 @@ BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs,
int64_t sector_num,
trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque);
- if (!drv)
+ if (!drv) {
+ trace_bdrv_aio_writev_null_drv(bs, sector_num, nb_sectors, opaque);
return NULL;
- if (bs->read_only)
+ }
+ if (bs->read_only) {
+ trace_bdrv_aio_writev_read_only(bs, sector_num, nb_sectors, opaque);
return NULL;
- if (bdrv_check_request(bs, sector_num, nb_sectors))
+ }
+ if (bdrv_check_request(bs, sector_num, nb_sectors)) {
+ trace_bdrv_aio_writev_out_of_range(bs, sector_num, nb_sectors, opaque);
return NULL;
+ }
if (bs->dirty_bitmap) {
blk_cb_data = blk_dirty_cb_alloc(bs, sector_num, nb_sectors, cb,
@@ -2216,6 +2228,8 @@ BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs,
int64_t sector_num,
if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
bs->wr_highest_sector = sector_num + nb_sectors - 1;
}
+ } else {
+ trace_bdrv_aio_writev_failed(bs, sector_num, nb_sectors, opaque);
}
return ret;
diff --git a/trace-events b/trace-events
index 10faa07..3518254 100644
--- a/trace-events
+++ b/trace-events
@@ -53,7 +53,14 @@ disable bdrv_aio_multiwrite_earlyfail(void *mcb) "mcb %p"
disable bdrv_aio_multiwrite_latefail(void *mcb, int i) "mcb %p i %d"
disable bdrv_aio_flush(void *bs, void *opaque) "bs %p opaque %p"
disable bdrv_aio_readv(void *bs, int64_t sector_num, int nb_sectors, void
*opaque) "bs %p sector_num %"PRId64" nb_sectors %d opaque %p"
+disable bdrv_aio_readv_null_drv(void *bs, int64_t sector_num, int nb_sectors,
void *opaque) "bs %p sector_num %"PRId64" nb_sectors %d opaque %p"
+disable bdrv_aio_readv_out_of_range(void *bs, int64_t sector_num, int
nb_sectors, void *opaque) "bs %p sector_num %"PRId64" nb_sectors %d opaque %p"
+disable bdrv_aio_readv_failed(void *bs, int64_t sector_num, int nb_sectors,
void *opaque) "bs %p sector_num %"PRId64" nb_sectors %d opaque %p"
disable bdrv_aio_writev(void *bs, int64_t sector_num, int nb_sectors, void
*opaque) "bs %p sector_num %"PRId64" nb_sectors %d opaque %p"
+disable bdrv_aio_writev_null_drv(void *bs, int64_t sector_num, int nb_sectors,
void *opaque) "bs %p sector_num %"PRId64" nb_sectors %d opaque %p"
+disable bdrv_aio_writev_read_only(void *bs, int64_t sector_num, int
nb_sectors, void *opaque) "bs %p sector_num %"PRId64" nb_sectors %d opaque %p"
+disable bdrv_aio_writev_out_of_range(void *bs, int64_t sector_num, int
nb_sectors, void *opaque) "bs %p sector_num %"PRId64" nb_sectors %d opaque %p"
+disable bdrv_aio_writev_failed(void *bs, int64_t sector_num, int nb_sectors,
void *opaque) "bs %p sector_num %"PRId64" nb_sectors %d opaque %p"
disable bdrv_set_locked(void *bs, int locked) "bs %p locked %d"
# hw/virtio-blk.c
--
1.7.5.3
- [Qemu-devel] [PATCH 00/13] QED image streaming, Stefan Hajnoczi, 2011/06/14
- [Qemu-devel] [PATCH 06/13] qed: add support for copy-on-read, Stefan Hajnoczi, 2011/06/14
- [Qemu-devel] [PATCH 07/13] qed: avoid deadlock on emulated synchronous I/O, Stefan Hajnoczi, 2011/06/14
- [Qemu-devel] [PATCH 09/13] block: add bdrv_aio_copy_backing(), Stefan Hajnoczi, 2011/06/14
- [Qemu-devel] [PATCH 04/13] qed: extract qed_start_allocating_write(), Stefan Hajnoczi, 2011/06/14
- [Qemu-devel] [PATCH 13/13] trace: trace bdrv_aio_readv/writev error paths,
Stefan Hajnoczi <=
- [Qemu-devel] [PATCH 05/13] qed: make qed_aio_write_alloc() reusable, Stefan Hajnoczi, 2011/06/14
- [Qemu-devel] [PATCH 12/13] qed: intelligent streaming implementation, Stefan Hajnoczi, 2011/06/14
- [Qemu-devel] [PATCH 08/13] qerror: add qerror_from_args() to create qerror objects, Stefan Hajnoczi, 2011/06/14
- [Qemu-devel] [PATCH 10/13] qmp: add QMP support for stream commands, Stefan Hajnoczi, 2011/06/14
- [Qemu-devel] [PATCH 11/13] block: add -drive stream=on|off, Stefan Hajnoczi, 2011/06/14
- [Qemu-devel] [PATCH 03/13] qed: replace is_write with flags field, Stefan Hajnoczi, 2011/06/14
- [Qemu-devel] [PATCH 01/13] qemu-config: }, { -> }, { to please checkpatch.pl, Stefan Hajnoczi, 2011/06/14
- [Qemu-devel] [PATCH 02/13] block: add -drive copy-on-read=on|off, Stefan Hajnoczi, 2011/06/14
- Re: [Qemu-devel] [PATCH 00/13] QED image streaming, Philipp Hahn, 2011/06/15