diff mbox series

[v20210601,11/38] tools/guest: save: move mfns array

Message ID 20210601161118.18986-12-olaf@aepfle.de (mailing list archive)
State Superseded
Headers show
Series leftover from 2020 | expand

Commit Message

Olaf Hering June 1, 2021, 4:10 p.m. UTC 
Remove allocation from hotpath, move mfns array into preallocated space.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
---
 tools/libs/saverestore/common.h | 2 ++
 tools/libs/saverestore/save.c   | 7 ++-----
 2 files changed, 4 insertions(+), 5 deletions(-)

Comments

Jürgen Groß June 2, 2021, 7:32 a.m. UTC | #1 
On 01.06.21 18:10, Olaf Hering wrote:
> Remove allocation from hotpath, move mfns array into preallocated space.
> 
> Signed-off-by: Olaf Hering <olaf@aepfle.de>

Reviewed-by: Juergen Gross <jgross@suse.com>


Juergen
diff mbox series

Patch

diff --git a/tools/libs/saverestore/common.h b/tools/libs/saverestore/common.h
index 0d94a4c01e..2335e6d27b 100644
--- a/tools/libs/saverestore/common.h
+++ b/tools/libs/saverestore/common.h
@@ -225,6 +225,8 @@  static inline int update_blob(struct xc_sr_blob *blob,
 
 struct xc_sr_save_arrays {
     xen_pfn_t batch_pfns[MAX_BATCH_SIZE];
+    /* write_batch: Mfns of the batch pfns. */
+    xen_pfn_t mfns[MAX_BATCH_SIZE];
 };
 
 struct xc_sr_restore_arrays {
diff --git a/tools/libs/saverestore/save.c b/tools/libs/saverestore/save.c
index b11ce70a11..1719ff08ba 100644
--- a/tools/libs/saverestore/save.c
+++ b/tools/libs/saverestore/save.c
@@ -88,7 +88,7 @@  static int write_checkpoint_record(struct xc_sr_context *ctx)
 static int write_batch(struct xc_sr_context *ctx)
 {
     xc_interface *xch = ctx->xch;
-    xen_pfn_t *mfns = NULL, *types = NULL;
+    xen_pfn_t *mfns = ctx->save.m->mfns, *types = NULL;
     void *guest_mapping = NULL;
     void **guest_data = NULL;
     void **local_pages = NULL;
@@ -105,8 +105,6 @@  static int write_batch(struct xc_sr_context *ctx)
 
     assert(nr_pfns != 0);
 
-    /* Mfns of the batch pfns. */
-    mfns = malloc(nr_pfns * sizeof(*mfns));
     /* Types of the batch pfns. */
     types = malloc(nr_pfns * sizeof(*types));
     /* Errors from attempting to map the gfns. */
@@ -118,7 +116,7 @@  static int write_batch(struct xc_sr_context *ctx)
     /* iovec[] for writev(). */
     iov = malloc((nr_pfns + 4) * sizeof(*iov));
 
-    if ( !mfns || !types || !errors || !guest_data || !local_pages || !iov )
+    if ( !types || !errors || !guest_data || !local_pages || !iov )
     {
         ERROR("Unable to allocate arrays for a batch of %u pages",
               nr_pfns);
@@ -277,7 +275,6 @@  static int write_batch(struct xc_sr_context *ctx)
     free(guest_data);
     free(errors);
     free(types);
-    free(mfns);
 
     return rc;
 }