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author | Santosh Jodh <santosh.jodh@citrix.com> | 2012-03-07 09:39:10 +0000 |
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committer | Santosh Jodh <santosh.jodh@citrix.com> | 2012-03-07 09:39:10 +0000 |
commit | 45db68b57f3d7839019726615420bd0c1495bdb6 (patch) | |
tree | d2f9118a6ee66a0b67a819593c858aff3f9fc638 | |
parent | 494939f0b0d6941f0982e9ff50e73761ce3890c9 (diff) | |
download | xen-45db68b57f3d7839019726615420bd0c1495bdb6.tar.gz xen-45db68b57f3d7839019726615420bd0c1495bdb6.tar.bz2 xen-45db68b57f3d7839019726615420bd0c1495bdb6.zip |
libxc: Replace malloc with alloca in hot path
Replace malloc with alloc in hot paths for improved performance.
Signed-off-by: Santosh Jodh <santosh.jodh@citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>
xen-unstable changeset: 24709:8ba7ae0b070b
xen-unstable date: Tue Feb 07 18:46:50 2012 +0000
-rw-r--r-- | tools/libxc/xc_linux_osdep.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/tools/libxc/xc_linux_osdep.c b/tools/libxc/xc_linux_osdep.c index 377c93867a..5ef5cd63f5 100644 --- a/tools/libxc/xc_linux_osdep.c +++ b/tools/libxc/xc_linux_osdep.c @@ -218,7 +218,7 @@ static void *linux_privcmd_map_foreign_bulk(xc_interface *xch, xc_osdep_handle h * IOCTL_PRIVCMD_MMAPBATCH_V2 is not supported - fall back to * IOCTL_PRIVCMD_MMAPBATCH. */ - xen_pfn_t *pfn = malloc(num * sizeof(*pfn)); + xen_pfn_t *pfn = alloca(num * sizeof(*pfn)); if ( pfn ) { @@ -264,8 +264,6 @@ static void *linux_privcmd_map_foreign_bulk(xc_interface *xch, xc_osdep_handle h break; } - free(pfn); - if ( rc == -ENOENT && i == num ) rc = 0; else if ( rc ) @@ -532,7 +530,7 @@ static void *do_gnttab_map_grant_refs(xc_gnttab *xch, xc_osdep_handle h, void *addr = NULL; int i; - map = malloc(sizeof(*map) + + map = alloca(sizeof(*map) + (count - 1) * sizeof(struct ioctl_gntdev_map_grant_ref)); if ( map == NULL ) return NULL; @@ -567,7 +565,6 @@ static void *do_gnttab_map_grant_refs(xc_gnttab *xch, xc_osdep_handle h, } out: - free(map); return addr; } |