From: San Mehat <san@google.com>
Date: Wed, 9 Sep 2009 15:41:45 +0000 (-0700)
Subject: BFS: Allow non priviledged tasks to bounce between SCHED_BATCH/NORMAL policies
X-Git-Tag: android-2.6.29-bfs
X-Git-Url: http://android.git.kernel.org/?p=kernel%2Fexperimental.git;a=commitdiff_plain;h=77ada37e38c8d824441c5d679fe3ef4ea9afa99e

BFS: Allow non priviledged tasks to bounce between SCHED_BATCH/NORMAL policies

    This is necessary for Android so that the VM can bump priorities of batch
threads around GC to avoid an inversion on GC.

Signed-off-by: San Mehat <san@google.com>
---

Index: android-omap/kernel/sched_bfs.c
===================================================================
--- android-omap.orig/kernel/sched_bfs.c	2009-10-05 15:40:26.000000000 +0800
+++ android-omap/kernel/sched_bfs.c	2009-10-05 15:41:04.000000000 +0800
@@ -3226,6 +3226,12 @@
 				case SCHED_BATCH:
 					if (policy == SCHED_BATCH)
 						goto out;
+					/*
+					 * ANDROID: Allow tasks to move between
+					 * SCHED_NORMAL <-> SCHED_BATCH
+					 */
+					if (policy == SCHED_NORMAL)
+						break;
 					if (policy != SCHED_IDLEPRIO)
 					    	return -EPERM;
 					break;