[v20210701,23/40] tools: restore: move types array

Commit Message

Olaf Hering July 1, 2021, 9:56 a.m. UTC

Remove allocation from hotpath, move types array into preallocated space.

Signed-off-by: Olaf Hering <[e-mail]>
Reviewed-by: Juergen Gross <[e-mail]>
---
 tools/libs/saverestore/common.h  |  1 +
 tools/libs/saverestore/restore.c | 12 +-----------
 2 files changed, 2 insertions(+), 11 deletions(-)

Patch

diff --git a/tools/libs/saverestore/common.h b/tools/libs/saverestore/common.h
index 8089449011..d798b79745 100644
--- a/tools/libs/saverestore/common.h
+++ b/tools/libs/saverestore/common.h
@@ -238,6 +238,7 @@  struct sr_save_arrays {
 struct sr_restore_arrays {
     /* handle_page_data */
     xen_pfn_t pfns[MAX_BATCH_SIZE];
+    uint32_t types[MAX_BATCH_SIZE];
 };
 
 struct xc_sr_context
diff --git a/tools/libs/saverestore/restore.c b/tools/libs/saverestore/restore.c
index c203ce503d..8ea125cf73 100644
--- a/tools/libs/saverestore/restore.c
+++ b/tools/libs/saverestore/restore.c
@@ -316,7 +316,7 @@  static int handle_page_data(struct xc_sr_context *ctx, struct xc_sr_record *rec)
     int rc = -1;
 
     xen_pfn_t *pfns = ctx->restore.m->pfns, pfn;
-    uint32_t *types = NULL, type;
+    uint32_t *types = ctx->restore.m->types, type;
 
     /*
      * v2 compatibility only exists for x86 streams.  This is a bit of a
@@ -363,14 +363,6 @@  static int handle_page_data(struct xc_sr_context *ctx, struct xc_sr_record *rec)
         goto err;
     }
 
-    types = malloc(pages->count * sizeof(*types));
-    if ( !types )
-    {
-        ERROR("Unable to allocate enough memory for %u pfns",
-              pages->count);
-        goto err;
-    }
-
     for ( i = 0; i < pages->count; ++i )
     {
         pfn = pages->pfn[i] & PAGE_DATA_PFN_MASK;
@@ -410,8 +402,6 @@  static int handle_page_data(struct xc_sr_context *ctx, struct xc_sr_record *rec)
     rc = process_page_data(ctx, pages->count, pfns, types,
                            &pages->pfn[pages->count]);
  err:
-    free(types);
-
     return rc;
 }