libxc: New hcall_buf_{prep,release} pre-mlock interface

Allow certain performance-critical hypercall wrappers to register data
buffers via a new interface which allows them to be 'bounced' into a
pre-mlock'ed page-sized per-thread data area. This saves the cost of
mlock/munlock on every such hypercall, which can be very expensive on
modern kernels.

Signed-off-by: Keir Fraser <keir.fraser@citrix.com>

1 files changed, 0 insertions, 16 deletions

diff --git a/tools/libxc/xg_private.c b/tools/libxc/xg_private.c
index 4dc3a5c66f..457001ce25 100644
--- a/tools/libxc/xg_private.c
+++ b/tools/libxc/xg_private.c
@@ -183,22 +183,6 @@ __attribute__((weak))
     return -1;
 }
 
-void *xg_memalign(size_t alignment, size_t size)
-{
-#if defined(_POSIX_C_SOURCE) && !defined(__sun__)
-    int ret;
-    void *ptr;
-    ret = posix_memalign(&ptr, alignment, size);
-    if (ret != 0)
-        return NULL;
-    return ptr;
-#elif defined(__NetBSD__) || defined(__OpenBSD__)
-    return valloc(size);
-#else
-    return memalign(alignment, size);
-#endif
-}
-
 /*
  * Local variables:
  * mode: C