[Xen-changelog] Prevent BVT scheduler to be set with a too low ctx_allow by applying

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User vhanquez@xxxxxxxxxxxxxxxxxxxxxxx
# Node ID 6b18f820f6a74f8c1b9600ccf408e8d9a1b9d026
# Parent  f5b119533cc825726c9ecaa3bd2650b38033d4d8
Prevent BVT scheduler to be set with a too low ctx_allow by applying
a 10 microsecs low limit to the user parameter.

Signed-off-by: Vincent Hanquez <vincent@xxxxxxxxxxxxx>

diff -r f5b119533cc8 -r 6b18f820f6a7 xen/common/sched_bvt.c
--- a/xen/common/sched_bvt.c    Thu Dec  1 14:22:22 2005
+++ b/xen/common/sched_bvt.c    Thu Dec  1 13:13:15 2005
@@ -67,6 +67,7 @@
 #define MCU            (s32)MICROSECS(100)    /* Minimum unit */
 #define MCU_ADVANCE    10                     /* default weight */
 #define TIME_SLOP      (s32)MICROSECS(50)     /* allow time to slip a bit */
+#define CTX_MIN        (s32)MICROSECS(10)     /* Low limit for ctx_allow */
 static s32 ctx_allow = (s32)MILLISECS(5);     /* context switch allowance */
 
 static inline void __add_to_runqueue_head(struct vcpu *d)
@@ -297,7 +298,11 @@
     if ( cmd->direction == SCHED_INFO_PUT )
         ctx_allow = params->ctx_allow;
     else
+    {
+        if ( ctx_allow < CTX_MIN )
+            ctx_allow = CTX_MIN;
         params->ctx_allow = ctx_allow;
+    }
     
     return 0;
 }

_______________________________________________
Xen-changelog mailing list
Xen-changelog@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-changelog