This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / include / linux / taskstats.h

diff --git a/include/linux/taskstats.h b/include/linux/taskstats.h
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+/* taskstats.h - exporting per-task statistics
+ *
+ * Copyright (C) Shailabh Nagar, IBM Corp. 2006
+ *           (C) Balbir Singh,   IBM Corp. 2006
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2.1 of the GNU Lesser General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#ifndef _LINUX_TASKSTATS_H
+#define _LINUX_TASKSTATS_H
+
+/* Format for per-task data returned to userland when
+ *     - a task exits
+ *     - listener requests stats for a task
+ *
+ * The struct is versioned. Newer versions should only add fields to
+ * the bottom of the struct to maintain backward compatibility.
+ *
+ *
+ * To add new fields
+ *     a) bump up TASKSTATS_VERSION
+ *     b) add comment indicating new version number at end of struct
+ *     c) add new fields after version comment; maintain 64-bit alignment
+ */
+
+#define TASKSTATS_VERSION      1
+
+struct taskstats {
+
+       /* Version 1 */
+       __u16   version;
+       __u16   padding[3];     /* Userspace should not interpret the padding
+                                * field which can be replaced by useful
+                                * fields if struct taskstats is extended.
+                                */
+
+       /* Delay accounting fields start
+        *
+        * All values, until comment "Delay accounting fields end" are
+        * available only if delay accounting is enabled, even though the last
+        * few fields are not delays
+        *
+        * xxx_count is the number of delay values recorded
+        * xxx_delay_total is the corresponding cumulative delay in nanoseconds
+        *
+        * xxx_delay_total wraps around to zero on overflow
+        * xxx_count incremented regardless of overflow
+        */
+
+       /* Delay waiting for cpu, while runnable
+        * count, delay_total NOT updated atomically
+        */
+       __u64   cpu_count;
+       __u64   cpu_delay_total;
+
+       /* Following four fields atomically updated using task->delays->lock */
+
+       /* Delay waiting for synchronous block I/O to complete
+        * does not account for delays in I/O submission
+        */
+       __u64   blkio_count;
+       __u64   blkio_delay_total;
+
+       /* Delay waiting for page fault I/O (swap in only) */
+       __u64   swapin_count;
+       __u64   swapin_delay_total;
+
+       /* cpu "wall-clock" running time
+        * On some architectures, value will adjust for cpu time stolen
+        * from the kernel in involuntary waits due to virtualization.
+        * Value is cumulative, in nanoseconds, without a corresponding count
+        * and wraps around to zero silently on overflow
+        */
+       __u64   cpu_run_real_total;
+
+       /* cpu "virtual" running time
+        * Uses time intervals seen by the kernel i.e. no adjustment
+        * for kernel's involuntary waits due to virtualization.
+        * Value is cumulative, in nanoseconds, without a corresponding count
+        * and wraps around to zero silently on overflow
+        */
+       __u64   cpu_run_virtual_total;
+       /* Delay accounting fields end */
+       /* version 1 ends here */
+};
+
+
+/*
+ * Commands sent from userspace
+ * Not versioned. New commands should only be inserted at the enum's end
+ * prior to __TASKSTATS_CMD_MAX
+ */
+
+enum {
+       TASKSTATS_CMD_UNSPEC = 0,       /* Reserved */
+       TASKSTATS_CMD_GET,              /* user->kernel request/get-response */
+       TASKSTATS_CMD_NEW,              /* kernel->user event */
+       __TASKSTATS_CMD_MAX,
+};
+
+#define TASKSTATS_CMD_MAX (__TASKSTATS_CMD_MAX - 1)
+
+enum {
+       TASKSTATS_TYPE_UNSPEC = 0,      /* Reserved */
+       TASKSTATS_TYPE_PID,             /* Process id */
+       TASKSTATS_TYPE_TGID,            /* Thread group id */
+       TASKSTATS_TYPE_STATS,           /* taskstats structure */
+       TASKSTATS_TYPE_AGGR_PID,        /* contains pid + stats */
+       TASKSTATS_TYPE_AGGR_TGID,       /* contains tgid + stats */
+       __TASKSTATS_TYPE_MAX,
+};
+
+#define TASKSTATS_TYPE_MAX (__TASKSTATS_TYPE_MAX - 1)
+
+enum {
+       TASKSTATS_CMD_ATTR_UNSPEC = 0,
+       TASKSTATS_CMD_ATTR_PID,
+       TASKSTATS_CMD_ATTR_TGID,
+       TASKSTATS_CMD_ATTR_REGISTER_CPUMASK,
+       TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK,
+       __TASKSTATS_CMD_ATTR_MAX,
+};
+
+#define TASKSTATS_CMD_ATTR_MAX (__TASKSTATS_CMD_ATTR_MAX - 1)
+
+/* NETLINK_GENERIC related info */
+
+#define TASKSTATS_GENL_NAME    "TASKSTATS"
+#define TASKSTATS_GENL_VERSION 0x1
+
+#endif /* _LINUX_TASKSTATS_H */