8abcb1d6b2
Include security fixes and other recent "stable" fixes OBS-URL: https://build.opensuse.org/request/show/664459 OBS-URL: https://build.opensuse.org/package/show/Virtualization/qemu?expand=0&rev=445
81 lines
2.7 KiB
Diff
81 lines
2.7 KiB
Diff
From: Tim Smith <tim.smith@citrix.com>
|
|
Date: Fri, 2 Nov 2018 10:01:09 +0000
|
|
Subject: xen_disk: Avoid repeated memory allocation
|
|
|
|
xen_disk currently allocates memory to hold the data for each ioreq
|
|
as that ioreq is used, and frees it afterwards. Because it requires
|
|
page-aligned blocks, this interacts poorly with non-page-aligned
|
|
allocations and balloons the heap.
|
|
|
|
Instead, allocate the maximum possible requirement, which is
|
|
BLKIF_MAX_SEGMENTS_PER_REQUEST pages (currently 11 pages) when
|
|
the ioreq is created, and keep that allocation until it is destroyed.
|
|
Since the ioreqs themselves are re-used via a free list, this
|
|
should actually improve memory usage.
|
|
|
|
Signed-off-by: Tim Smith <tim.smith@citrix.com>
|
|
[BR: BSC#1100408]
|
|
Signed-off-by: Bruce Rogers <brogers@suse.com>
|
|
---
|
|
hw/block/xen_disk.c | 9 ++++-----
|
|
1 file changed, 4 insertions(+), 5 deletions(-)
|
|
|
|
diff --git a/hw/block/xen_disk.c b/hw/block/xen_disk.c
|
|
index d9a55faf27..df99162520 100644
|
|
--- a/hw/block/xen_disk.c
|
|
+++ b/hw/block/xen_disk.c
|
|
@@ -110,7 +110,6 @@ static void ioreq_reset(struct ioreq *ioreq)
|
|
memset(&ioreq->req, 0, sizeof(ioreq->req));
|
|
ioreq->status = 0;
|
|
ioreq->start = 0;
|
|
- ioreq->buf = NULL;
|
|
ioreq->size = 0;
|
|
ioreq->presync = 0;
|
|
|
|
@@ -135,6 +134,9 @@ static struct ioreq *ioreq_start(struct XenBlkDev *blkdev)
|
|
/* allocate new struct */
|
|
ioreq = g_malloc0(sizeof(*ioreq));
|
|
ioreq->blkdev = blkdev;
|
|
+ ioreq->buf = qemu_memalign(XC_PAGE_SIZE,
|
|
+ BLKIF_MAX_SEGMENTS_PER_REQUEST *
|
|
+ XC_PAGE_SIZE);
|
|
blkdev->requests_total++;
|
|
qemu_iovec_init(&ioreq->v, 1);
|
|
} else {
|
|
@@ -317,14 +319,12 @@ static void qemu_aio_complete(void *opaque, int ret)
|
|
if (ret == 0) {
|
|
ioreq_grant_copy(ioreq);
|
|
}
|
|
- qemu_vfree(ioreq->buf);
|
|
break;
|
|
case BLKIF_OP_WRITE:
|
|
case BLKIF_OP_FLUSH_DISKCACHE:
|
|
if (!ioreq->req.nr_segments) {
|
|
break;
|
|
}
|
|
- qemu_vfree(ioreq->buf);
|
|
break;
|
|
default:
|
|
break;
|
|
@@ -392,12 +392,10 @@ static int ioreq_runio_qemu_aio(struct ioreq *ioreq)
|
|
{
|
|
struct XenBlkDev *blkdev = ioreq->blkdev;
|
|
|
|
- ioreq->buf = qemu_memalign(XC_PAGE_SIZE, ioreq->size);
|
|
if (ioreq->req.nr_segments &&
|
|
(ioreq->req.operation == BLKIF_OP_WRITE ||
|
|
ioreq->req.operation == BLKIF_OP_FLUSH_DISKCACHE) &&
|
|
ioreq_grant_copy(ioreq)) {
|
|
- qemu_vfree(ioreq->buf);
|
|
goto err;
|
|
}
|
|
|
|
@@ -1007,6 +1005,7 @@ static int blk_free(struct XenDevice *xendev)
|
|
ioreq = QLIST_FIRST(&blkdev->freelist);
|
|
QLIST_REMOVE(ioreq, list);
|
|
qemu_iovec_destroy(&ioreq->v);
|
|
+ qemu_vfree(ioreq->buf);
|
|
g_free(ioreq);
|
|
}
|
|
|