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-rw-r--r--arch/ia64/kernel/perfmon.c43
1 files changed, 33 insertions, 10 deletions
diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c
index 376fcbc..71c1016 100644
--- a/arch/ia64/kernel/perfmon.c
+++ b/arch/ia64/kernel/perfmon.c
@@ -1265,6 +1265,8 @@ out:
}
EXPORT_SYMBOL(pfm_unregister_buffer_fmt);
+extern void update_pal_halt_status(int);
+
static int
pfm_reserve_session(struct task_struct *task, int is_syswide, unsigned int cpu)
{
@@ -1311,6 +1313,11 @@ pfm_reserve_session(struct task_struct *task, int is_syswide, unsigned int cpu)
is_syswide,
cpu));
+ /*
+ * disable default_idle() to go to PAL_HALT
+ */
+ update_pal_halt_status(0);
+
UNLOCK_PFS(flags);
return 0;
@@ -1366,6 +1373,12 @@ pfm_unreserve_session(pfm_context_t *ctx, int is_syswide, unsigned int cpu)
is_syswide,
cpu));
+ /*
+ * if possible, enable default_idle() to go into PAL_HALT
+ */
+ if (pfm_sessions.pfs_task_sessions == 0 && pfm_sessions.pfs_sys_sessions == 0)
+ update_pal_halt_status(1);
+
UNLOCK_PFS(flags);
return 0;
@@ -4202,7 +4215,7 @@ pfm_context_load(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
DPRINT(("cannot load to [%d], invalid ctx_state=%d\n",
req->load_pid,
ctx->ctx_state));
- return -EINVAL;
+ return -EBUSY;
}
DPRINT(("load_pid [%d] using_dbreg=%d\n", req->load_pid, ctx->ctx_fl_using_dbreg));
@@ -4704,16 +4717,26 @@ recheck:
if (task == current || ctx->ctx_fl_system) return 0;
/*
- * if context is UNLOADED we are safe to go
- */
- if (state == PFM_CTX_UNLOADED) return 0;
-
- /*
- * no command can operate on a zombie context
+ * we are monitoring another thread
*/
- if (state == PFM_CTX_ZOMBIE) {
- DPRINT(("cmd %d state zombie cannot operate on context\n", cmd));
- return -EINVAL;
+ switch(state) {
+ case PFM_CTX_UNLOADED:
+ /*
+ * if context is UNLOADED we are safe to go
+ */
+ return 0;
+ case PFM_CTX_ZOMBIE:
+ /*
+ * no command can operate on a zombie context
+ */
+ DPRINT(("cmd %d state zombie cannot operate on context\n", cmd));
+ return -EINVAL;
+ case PFM_CTX_MASKED:
+ /*
+ * PMU state has been saved to software even though
+ * the thread may still be running.
+ */
+ if (cmd != PFM_UNLOAD_CONTEXT) return 0;
}
/*
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