option to set global shm_size

engine/compiler/compiler.go

@@ -51,6 +51,7 @@ type Resources struct {
 	CPUPeriod  int64
 	CPUShares  int64
 	CPUSet     []string
+	ShmSize    int64
 }
 
 // Compiler compiles the Yaml configuration file to an
@@ -371,12 +372,15 @@ func (c *Compiler) Compile(ctx context.Context, args runtime.CompilerArgs) runti
 		// the resource limits defined in the yaml currently
 		// take precedence over global values. This is something
 		// we should re-think in a future release.
-		if step.MemSwapLimit != 0 {
+		if step.MemSwapLimit == 0 {
 			step.MemSwapLimit = c.Resources.MemorySwap
 		}
-		if step.MemLimit != 0 {
+		if step.MemLimit == 0 {
 			step.MemLimit = c.Resources.Memory
 		}
+		if step.ShmSize == 0 {
+			step.ShmSize = c.Resources.ShmSize
+		}
 		step.CPUPeriod = c.Resources.CPUPeriod
 		step.CPUQuota = c.Resources.CPUQuota
 		step.CPUShares = c.Resources.CPUShares