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qcow2: do decompression in threads 

Do decompression in threads, like it is already done for compression.
This improves asynchronous compressed reads performance.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
master
Vladimir Sementsov-Ogievskiy 2018-11-01 21:27:38 +03:00 committed by Kevin Wolf
parent c3c10f7295
commit e23c9d7a1c
1 changed files with 27 additions and 7 deletions
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34
block/qcow2.c
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@ -3807,20 +3807,24 @@ static ssize_t qcow2_decompress(void *dest, size_t dest_size,
#define MAX_COMPRESS_THREADS 4
typedef ssize_t (*Qcow2CompressFunc)(void *dest, size_t dest_size,
const void *src, size_t src_size);
typedef struct Qcow2CompressData {
void *dest;
size_t dest_size;
const void *src;
size_t src_size;
ssize_t ret;
Qcow2CompressFunc func;
} Qcow2CompressData;
static int qcow2_compress_pool_func(void *opaque)
{
Qcow2CompressData *data = opaque;
data->ret = qcow2_compress(data->dest, data->dest_size,
data->src, data->src_size);
data->ret = data->func(data->dest, data->dest_size,
data->src, data->src_size);
return 0;
}
@ -3830,10 +3834,9 @@ static void qcow2_compress_complete(void *opaque, int ret)
qemu_coroutine_enter(opaque);
}
/* See qcow2_compress definition for parameters description */
static ssize_t qcow2_co_compress(BlockDriverState *bs,
void *dest, size_t dest_size,
const void *src, size_t src_size)
static ssize_t coroutine_fn
qcow2_co_do_compress(BlockDriverState *bs, void *dest, size_t dest_size,
const void *src, size_t src_size, Qcow2CompressFunc func)
{
BDRVQcow2State *s = bs->opaque;
BlockAIOCB *acb;
@ -3843,6 +3846,7 @@ static ssize_t qcow2_co_compress(BlockDriverState *bs,
.dest_size = dest_size,
.src = src,
.src_size = src_size,
.func = func,
};
while (s->nb_compress_threads >= MAX_COMPRESS_THREADS) {
@ -3865,6 +3869,22 @@ static ssize_t qcow2_co_compress(BlockDriverState *bs,
return arg.ret;
}
static ssize_t coroutine_fn
qcow2_co_compress(BlockDriverState *bs, void *dest, size_t dest_size,
const void *src, size_t src_size)
{
return qcow2_co_do_compress(bs, dest, dest_size, src, src_size,
qcow2_compress);
}
static ssize_t coroutine_fn
qcow2_co_decompress(BlockDriverState *bs, void *dest, size_t dest_size,
const void *src, size_t src_size)
{
return qcow2_co_do_compress(bs, dest, dest_size, src, src_size,
qcow2_decompress);
}
/* XXX: put compressed sectors first, then all the cluster aligned
tables to avoid losing bytes in alignment */
static coroutine_fn int
@ -3993,7 +4013,7 @@ qcow2_co_preadv_compressed(BlockDriverState *bs,
goto fail;
}
if (qcow2_decompress(out_buf, s->cluster_size, buf, csize) < 0) {
if (qcow2_co_decompress(bs, out_buf, s->cluster_size, buf, csize) < 0) {
ret = -EIO;
goto fail;
}