@@ -219,6 +219,8 @@ struct xc_sr_save_arrays {
xen_pfn_t types[MAX_BATCH_SIZE];
/* write_batch: Errors from attempting to map the gfns. */
int errors[MAX_BATCH_SIZE];
+ /* write_batch: iovec[] for writev(). */
+ struct iovec iov[MAX_BATCH_SIZE + 4];
};
struct xc_sr_restore_arrays {
@@ -97,7 +97,7 @@ static int write_batch(struct xc_sr_context *ctx)
unsigned int nr_pfns = ctx->save.nr_batch_pfns;
void *page, *orig_page;
uint64_t *rec_pfns = NULL;
- struct iovec *iov = NULL; int iovcnt = 0;
+ struct iovec *iov = ctx->save.m->iov; int iovcnt = 0;
struct xc_sr_rec_page_data_header hdr = { 0 };
struct xc_sr_record rec = {
.type = REC_TYPE_PAGE_DATA,
@@ -109,10 +109,8 @@ static int write_batch(struct xc_sr_context *ctx)
guest_data = calloc(nr_pfns, sizeof(*guest_data));
/* Pointers to locally allocated pages. Need freeing. */
local_pages = calloc(nr_pfns, sizeof(*local_pages));
- /* iovec[] for writev(). */
- iov = malloc((nr_pfns + 4) * sizeof(*iov));
- if ( !guest_data || !local_pages || !iov )
+ if ( !guest_data || !local_pages )
{
ERROR("Unable to allocate arrays for a batch of %u pages",
nr_pfns);
@@ -266,7 +264,6 @@ static int write_batch(struct xc_sr_context *ctx)
xenforeignmemory_unmap(xch->fmem, guest_mapping, nr_pages_mapped);
for ( i = 0; local_pages && i < nr_pfns; ++i )
free(local_pages[i]);
- free(iov);
free(local_pages);
free(guest_data);
Remove allocation from hotpath, move iov array into preallocated space. Signed-off-by: Olaf Hering <olaf@aepfle.de> --- tools/libs/guest/xg_sr_common.h | 2 ++ tools/libs/guest/xg_sr_save.c | 7 ++----- 2 files changed, 4 insertions(+), 5 deletions(-)