perfmon: base code

Index: o3/perfmon/perfmon_attach.c
===================================================================
@@ -0,0 +1,86 @@
+/*
+ * perfmon_attach.c: perfmon2 load/unload functions
+ *
+ * This file implements the perfmon2 interface which
+ * provides access to the hardware performance counters
+ * of the host processor.
+ *
+ *
+ * The initial version of perfmon.c was written by
+ * Ganesh Venkitachalam, IBM Corp.
+ *
+ * Then it was modified for perfmon-1.x by Stephane Eranian and
+ * David Mosberger, Hewlett Packard Co.
+ *
+ * Version Perfmon-2.x is a complete rewrite of perfmon-1.x
+ * by Stephane Eranian, Hewlett Packard Co.
+ *
+ * Copyright (c) 1999-2006 Hewlett-Packard Development Company, L.P.
+ * Contributed by Stephane Eranian <[email protected]>
+ *                David Mosberger-Tang <[email protected]>
+ *
+ * More information about perfmon available at:
+ * 	http://www.hpl.hp.com/research/linux/perfmon
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ * 02111-1307 USA
+ */
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/perfmon_kern.h>
+#include "perfmon_priv.h"
+
+/**
+ * __pfm_exit_thread - detach and free context on thread exit
+ */
+void __pfm_exit_thread(void)
+{
+	struct pfm_context *ctx;
+	unsigned long flags;
+	int free_ok = 0, ret = -1;
+
+	ctx  = current->pfm_context;
+
+	spin_lock_irqsave(&ctx->lock, flags);
+
+	PFM_DBG("state=%d is_self=%d", ctx->state, ctx->flags.is_self);
+
+	/*
+	 * __pfm_unload_context() cannot fail
+	 * in the context states we are interested in
+	 */
+	switch (ctx->state) {
+	case PFM_CTX_LOADED:
+		ret = __pfm_unload_context(ctx);
+		break;
+	case PFM_CTX_ZOMBIE:
+		ret = __pfm_unload_context(ctx);
+		free_ok = 1;
+		break;
+	default:
+		BUG_ON(ctx->state != PFM_CTX_LOADED);
+		break;
+	}
+	spin_unlock_irqrestore(&ctx->lock, flags);
+
+	if (!ret)
+		pfm_session_release();
+
+	/*
+	 * All memory free operations (especially for vmalloc'ed memory)
+	 * MUST be done with interrupts ENABLED.
+	 */
+	if (free_ok)
+		pfm_free_context(ctx);
+}

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Index: o3/include/linux/sched.h
===================================================================
@@ -1352,6 +1352,9 @@
 	unsigned long default_timer_slack_ns;
 
 	struct list_head	*scm_work_list;
+#ifdef CONFIG_PERFMON
+ 	struct pfm_context *pfm_context;
+#endif
 };
 
 /*