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qcow2: Add some tracing 

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
This commit is contained in:
Kevin Wolf 2012-03-01 18:36:21 +01:00
parent 14fe292d86
commit 3cce16f44d
4 changed files with 65 additions and 1 deletions
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18
block/qcow2-cache.c
View File

@ -25,6 +25,7 @@
#include "block_int.h"
#include "qemu-common.h"
#include "qcow2.h"
#include "trace.h"
typedef struct Qcow2CachedTable {
void* table;
@ -100,6 +101,9 @@ static int qcow2_cache_entry_flush(BlockDriverState *bs, Qcow2Cache *c, int i)
return 0;
}
trace_qcow2_cache_entry_flush(qemu_coroutine_self(),
c == s->l2_table_cache, i);
if (c->depends) {
ret = qcow2_cache_flush_dependency(bs, c);
} else if (c->depends_on_flush) {
@ -132,10 +136,13 @@ static int qcow2_cache_entry_flush(BlockDriverState *bs, Qcow2Cache *c, int i)
int qcow2_cache_flush(BlockDriverState *bs, Qcow2Cache *c)
{
BDRVQcowState *s = bs->opaque;
int result = 0;
int ret;
int i;
trace_qcow2_cache_flush(qemu_coroutine_self(), c == s->l2_table_cache);
for (i = 0; i < c->size; i++) {
ret = qcow2_cache_entry_flush(bs, c, i);
if (ret < 0 && result != -ENOSPC) {
@ -218,6 +225,9 @@ static int qcow2_cache_do_get(BlockDriverState *bs, Qcow2Cache *c,
int i;
int ret;
trace_qcow2_cache_get(qemu_coroutine_self(), c == s->l2_table_cache,
offset, read_from_disk);
/* Check if the table is already cached */
for (i = 0; i < c->size; i++) {
if (c->entries[i].offset == offset) {
@ -227,6 +237,8 @@ static int qcow2_cache_do_get(BlockDriverState *bs, Qcow2Cache *c,
/* If not, write a table back and replace it */
i = qcow2_cache_find_entry_to_replace(c);
trace_qcow2_cache_get_replace_entry(qemu_coroutine_self(),
c == s->l2_table_cache, i);
if (i < 0) {
return i;
}
@ -236,6 +248,8 @@ static int qcow2_cache_do_get(BlockDriverState *bs, Qcow2Cache *c,
return ret;
}
trace_qcow2_cache_get_read(qemu_coroutine_self(),
c == s->l2_table_cache, i);
c->entries[i].offset = 0;
if (read_from_disk) {
if (c == s->l2_table_cache) {
@ -258,6 +272,10 @@ found:
c->entries[i].cache_hits++;
c->entries[i].ref++;
*table = c->entries[i].table;
trace_qcow2_cache_get_done(qemu_coroutine_self(),
c == s->l2_table_cache, i);
return 0;
}

15
block/qcow2-cluster.c
View File

@ -27,6 +27,7 @@
#include "qemu-common.h"
#include "block_int.h"
#include "block/qcow2.h"
#include "trace.h"
int qcow2_grow_l1_table(BlockDriverState *bs, int min_size, bool exact_size)
{
@ -170,6 +171,8 @@ static int l2_allocate(BlockDriverState *bs, int l1_index, uint64_t **table)
old_l2_offset = s->l1_table[l1_index];
trace_qcow2_l2_allocate(bs, l1_index);
/* allocate a new l2 entry */
l2_offset = qcow2_alloc_clusters(bs, s->l2_size * sizeof(uint64_t));
@ -184,6 +187,7 @@ static int l2_allocate(BlockDriverState *bs, int l1_index, uint64_t **table)
/* allocate a new entry in the l2 cache */
trace_qcow2_l2_allocate_get_empty(bs, l1_index);
ret = qcow2_cache_get_empty(bs, s->l2_table_cache, l2_offset, (void**) table);
if (ret < 0) {
return ret;
@ -216,6 +220,7 @@ static int l2_allocate(BlockDriverState *bs, int l1_index, uint64_t **table)
/* write the l2 table to the file */
BLKDBG_EVENT(bs->file, BLKDBG_L2_ALLOC_WRITE);
trace_qcow2_l2_allocate_write_l2(bs, l1_index);
qcow2_cache_entry_mark_dirty(s->l2_table_cache, l2_table);
ret = qcow2_cache_flush(bs, s->l2_table_cache);
if (ret < 0) {
@ -223,6 +228,7 @@ static int l2_allocate(BlockDriverState *bs, int l1_index, uint64_t **table)
}
/* update the L1 entry */
trace_qcow2_l2_allocate_write_l1(bs, l1_index);
s->l1_table[l1_index] = l2_offset | QCOW_OFLAG_COPIED;
ret = write_l1_entry(bs, l1_index);
if (ret < 0) {
@ -230,9 +236,11 @@ static int l2_allocate(BlockDriverState *bs, int l1_index, uint64_t **table)
}
*table = l2_table;
trace_qcow2_l2_allocate_done(bs, l1_index, 0);
return 0;
fail:
trace_qcow2_l2_allocate_done(bs, l1_index, ret);
qcow2_cache_put(bs, s->l2_table_cache, (void**) table);
s->l1_table[l1_index] = old_l2_offset;
return ret;
@ -584,6 +592,8 @@ int qcow2_alloc_cluster_link_l2(BlockDriverState *bs, QCowL2Meta *m)
uint64_t cluster_offset = m->cluster_offset;
bool cow = false;
trace_qcow2_cluster_link_l2(qemu_coroutine_self(), m->nb_clusters);
if (m->nb_clusters == 0)
return 0;
@ -695,6 +705,9 @@ int qcow2_alloc_cluster_offset(BlockDriverState *bs, uint64_t offset,
unsigned int nb_clusters, i = 0;
QCowL2Meta *old_alloc;
trace_qcow2_alloc_clusters_offset(qemu_coroutine_self(), offset,
n_start, n_end);
ret = get_cluster_table(bs, offset, &l2_table, &l2_offset, &l2_index);
if (ret < 0) {
return ret;
@ -793,7 +806,7 @@ again:
QLIST_INSERT_HEAD(&s->cluster_allocs, m, next_in_flight);
/* allocate a new cluster */
trace_qcow2_cluster_alloc_phys(qemu_coroutine_self());
cluster_offset = qcow2_alloc_clusters(bs, nb_clusters * s->cluster_size);
if (cluster_offset < 0) {
ret = cluster_offset;

9
block/qcow2.c
View File

@ -29,6 +29,7 @@
#include "block/qcow2.h"
#include "qemu-error.h"
#include "qerror.h"
#include "trace.h"
/*
Differences with QCOW:
@ -569,6 +570,9 @@ static coroutine_fn int qcow2_co_writev(BlockDriverState *bs,
.nb_clusters = 0,
};
trace_qcow2_writev_start_req(qemu_coroutine_self(), sector_num,
remaining_sectors);
qemu_co_queue_init(&l2meta.dependent_requests);
qemu_iovec_init(&hd_qiov, qiov->niov);
@ -579,6 +583,7 @@ static coroutine_fn int qcow2_co_writev(BlockDriverState *bs,
while (remaining_sectors != 0) {
trace_qcow2_writev_start_part(qemu_coroutine_self());
index_in_cluster = sector_num & (s->cluster_sectors - 1);
n_end = index_in_cluster + remaining_sectors;
if (s->crypt_method &&
@ -619,6 +624,8 @@ static coroutine_fn int qcow2_co_writev(BlockDriverState *bs,
BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO);
qemu_co_mutex_unlock(&s->lock);
trace_qcow2_writev_data(qemu_coroutine_self(),
(cluster_offset >> 9) + index_in_cluster);
ret = bdrv_co_writev(bs->file,
(cluster_offset >> 9) + index_in_cluster,
cur_nr_sectors, &hd_qiov);
@ -637,6 +644,7 @@ static coroutine_fn int qcow2_co_writev(BlockDriverState *bs,
remaining_sectors -= cur_nr_sectors;
sector_num += cur_nr_sectors;
bytes_done += cur_nr_sectors * 512;
trace_qcow2_writev_done_part(qemu_coroutine_self(), cur_nr_sectors);
}
ret = 0;
@ -647,6 +655,7 @@ fail:
qemu_iovec_destroy(&hd_qiov);
qemu_vfree(cluster_data);
trace_qcow2_writev_done_req(qemu_coroutine_self(), ret);
return ret;
}

24
trace-events
View File

@ -312,6 +312,30 @@ scsi_request_sense(int target, int lun, int tag) "target %d lun %d tag %d"
# vl.c
vm_state_notify(int running, int reason) "running %d reason %d"
# block/qcow2.c
qcow2_writev_start_req(void *co, int64_t sector, int nb_sectors) "co %p sector %" PRIx64 " nb_sectors %d"
qcow2_writev_done_req(void *co, int ret) "co %p ret %d"
qcow2_writev_start_part(void *co) "co %p"
qcow2_writev_done_part(void *co, int cur_nr_sectors) "co %p cur_nr_sectors %d"
qcow2_writev_data(void *co, uint64_t offset) "co %p offset %" PRIx64
qcow2_alloc_clusters_offset(void *co, uint64_t offset, int n_start, int n_end) "co %p offet %" PRIx64 " n_start %d n_end %d"
qcow2_cluster_alloc_phys(void *co) "co %p"
qcow2_cluster_link_l2(void *co, int nb_clusters) "co %p nb_clusters %d"
qcow2_l2_allocate(void *bs, int l1_index) "bs %p l1_index %d"
qcow2_l2_allocate_get_empty(void *bs, int l1_index) "bs %p l1_index %d"
qcow2_l2_allocate_write_l2(void *bs, int l1_index) "bs %p l1_index %d"
qcow2_l2_allocate_write_l1(void *bs, int l1_index) "bs %p l1_index %d"
qcow2_l2_allocate_done(void *bs, int l1_index, int ret) "bs %p l1_index %d ret %d"
qcow2_cache_get(void *co, int c, uint64_t offset, bool read_from_disk) "co %p is_l2_cache %d offset %" PRIx64 " read_from_disk %d"
qcow2_cache_get_replace_entry(void *co, int c, int i) "co %p is_l2_cache %d index %d"
qcow2_cache_get_read(void *co, int c, int i) "co %p is_l2_cache %d index %d"
qcow2_cache_get_done(void *co, int c, int i) "co %p is_l2_cache %d index %d"
qcow2_cache_flush(void *co, int c) "co %p is_l2_cache %d"
qcow2_cache_entry_flush(void *co, int c, int i) "co %p is_l2_cache %d index %d"
# block/qed-l2-cache.c
qed_alloc_l2_cache_entry(void *l2_cache, void *entry) "l2_cache %p entry %p"
qed_unref_l2_cache_entry(void *entry, int ref) "entry %p ref %d"