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block/block-copy: add memory limit

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Currently total allocation for parallel requests to block-copy instance
is unlimited. Let's limit it to 128 MiB.

For now block-copy is used only in backup, so actually we limit total
allocation for backup job.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 20191022111805.3432-6-vsementsov@virtuozzo.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2019-10-22 14:18:04 +03:00 committed by Max Reitz
parent f16ba00de9
commit 7f739d0e53
2 changed files with 8 additions and 0 deletions
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5
block/block-copy.c
View file

@ -21,6 +21,7 @@
#include "qemu/units.h"
#define BLOCK_COPY_MAX_COPY_RANGE (16 * MiB)
#define BLOCK_COPY_MAX_MEM (128 * MiB)
static void coroutine_fn block_copy_wait_inflight_reqs(BlockCopyState *s,
int64_t start,
@ -64,6 +65,7 @@ void block_copy_state_free(BlockCopyState *s)
}
bdrv_release_dirty_bitmap(s->copy_bitmap);
shres_destroy(s->mem);
g_free(s);
}
@ -95,6 +97,7 @@ BlockCopyState *block_copy_state_new(BdrvChild *source, BdrvChild *target,
.cluster_size = cluster_size,
.len = bdrv_dirty_bitmap_size(copy_bitmap),
.write_flags = write_flags,
.mem = shres_create(BLOCK_COPY_MAX_MEM),
};
s->copy_range_size = QEMU_ALIGN_DOWN(max_transfer, cluster_size),
@ -313,7 +316,9 @@ int coroutine_fn block_copy(BlockCopyState *s,
bdrv_reset_dirty_bitmap(s->copy_bitmap, start, chunk_end - start);
co_get_from_shres(s->mem, chunk_end - start);
ret = block_copy_do_copy(s, start, chunk_end, error_is_read);
co_put_to_shres(s->mem, chunk_end - start);
if (ret < 0) {
bdrv_set_dirty_bitmap(s->copy_bitmap, start, chunk_end - start);
break;

3
include/block/block-copy.h
View file

@ -16,6 +16,7 @@
#define BLOCK_COPY_H
#include "block/block.h"
#include "qemu/co-shared-resource.h"
typedef struct BlockCopyInFlightReq {
int64_t start_byte;
@ -69,6 +70,8 @@ typedef struct BlockCopyState {
*/
ProgressResetCallbackFunc progress_reset_callback;
void *progress_opaque;
SharedResource *mem;
} BlockCopyState;
BlockCopyState *block_copy_state_new(BdrvChild *source, BdrvChild *target,