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taskstats: version 12 with thread group and exe info
The task exit struct needs some crucial information to be able to provide an enhanced version of process and thread accounting. This change provides: 1. ac_tgid in additon to ac_pid 2. thread group execution walltime in ac_tgetime 3. flag AGROUP in ac_flag to indicate the last task in a thread group / process 4. device ID and inode of task's /proc/self/exe in ac_exe_dev and ac_exe_inode 5. tools/accounting/procacct as demonstrator When a task exits, taskstats are reported to userspace including the task's pid and ppid, but without the id of the thread group this task is part of. Without the tgid, the stats of single tasks cannot be correlated to each other as a thread group (process). The taskstats documentation suggests that on process exit a data set consisting of accumulated stats for the whole group is produced. But such an additional set of stats is only produced for actually multithreaded processes, not groups that had only one thread, and also those stats only contain data about delay accounting and not the more basic information about CPU and memory resource usage. Adding the AGROUP flag to be set when the last task of a group exited enables determination of process end also for single-threaded processes. My applicaton basically does enhanced process accounting with summed cputime, biggest maxrss, tasks per process. The data is not available with the traditional BSD process accounting (which is not designed to be extensible) and the taskstats interface allows more efficient on-the-fly grouping and summing of the stats, anyway, without intermediate disk writes. Furthermore, I do carry statistics on which exact program binary is used how often with associated resources, getting a picture on how important which parts of a collection of installed scientific software in different versions are, and how well they put load on the machine. This is enabled by providing information on /proc/self/exe for each task. I assume the two 64-bit fields for device ID and inode are more appropriate than the possibly large resolved path to keep the data volume down. Add the tgid to the stats to complete task identification, the flag AGROUP to mark the last task of a group, the group wallclock time, and inode-based identification of the associated executable file. Add tools/accounting/procacct.c as a simplified fork of getdelays.c to demonstrate process and thread accounting. [thomas.orgis@uni-hamburg.de: fix version number in comment] Link: https://lkml.kernel.org/r/20220405003601.7a5f6008@plasteblaster Link: https://lkml.kernel.org/r/20220331004106.64e5616b@plasteblaster Signed-off-by: Dr. Thomas Orgis <thomas.orgis@uni-hamburg.de> Reviewed-by: Ismael Luceno <ismael@iodev.co.uk> Cc: Balbir Singh <bsingharora@gmail.com> Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: xu xin <xu.xin16@zte.com.cn> Cc: Yang Yang <yang.yang29@zte.com.cn> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Dr. Thomas Orgis
akpm
parent
f8323a0cb9
commit
0e0af57e0e
@ -103,12 +103,13 @@ struct acct_v3
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/*
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* accounting flags
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*/
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/* bit set when the process ... */
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/* bit set when the process/task ... */
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#define AFORK 0x01 /* ... executed fork, but did not exec */
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#define ASU 0x02 /* ... used super-user privileges */
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#define ACOMPAT 0x04 /* ... used compatibility mode (VAX only not used) */
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#define ACORE 0x08 /* ... dumped core */
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#define AXSIG 0x10 /* ... was killed by a signal */
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#define AGROUP 0x20 /* ... was the last task of the process (task group) */
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#if defined(__BYTE_ORDER) ? __BYTE_ORDER == __BIG_ENDIAN : defined(__BIG_ENDIAN)
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#define ACCT_BYTEORDER 0x80 /* accounting file is big endian */
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@ -34,7 +34,7 @@
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*/
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#define TASKSTATS_VERSION 11
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#define TASKSTATS_VERSION 12
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#define TS_COMM_LEN 32 /* should be >= TASK_COMM_LEN
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* in linux/sched.h */
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@ -48,7 +48,8 @@ struct taskstats {
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__u32 ac_exitcode; /* Exit status */
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/* The accounting flags of a task as defined in <linux/acct.h>
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* Defined values are AFORK, ASU, ACOMPAT, ACORE, and AXSIG.
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* Defined values are AFORK, ASU, ACOMPAT, ACORE, AXSIG, and AGROUP.
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* (AGROUP since version 12).
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*/
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__u8 ac_flag; /* Record flags */
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__u8 ac_nice; /* task_nice */
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@ -173,9 +174,26 @@ struct taskstats {
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/* v10: 64-bit btime to avoid overflow */
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__u64 ac_btime64; /* 64-bit begin time */
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/* Delay waiting for memory compact */
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/* v11: Delay waiting for memory compact */
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__u64 compact_count;
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__u64 compact_delay_total;
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/* v12 begin */
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__u32 ac_tgid; /* thread group ID */
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/* Thread group walltime up to now. This is total process walltime if
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* AGROUP flag is set.
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*/
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__u64 ac_tgetime __attribute__((aligned(8)));
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/* Lightweight information to identify process binary files.
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* This leaves userspace to match this to a file system path, using
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* MAJOR() and MINOR() macros to identify a device and mount point,
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* the inode to identify the executable file. This is /proc/self/exe
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* at the end, so matching the most recent exec(). Values are zero
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* for kernel threads.
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*/
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__u64 ac_exe_dev; /* program binary device ID */
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__u64 ac_exe_inode; /* program binary inode number */
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/* v12 end */
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};
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@ -9,6 +9,7 @@
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#include <linux/kernel.h>
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#include <linux/taskstats_kern.h>
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#include <linux/tsacct_kern.h>
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#include <linux/acct.h>
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#include <linux/delayacct.h>
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#include <linux/cpumask.h>
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#include <linux/percpu.h>
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@ -153,6 +154,23 @@ static void send_cpu_listeners(struct sk_buff *skb,
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up_write(&listeners->sem);
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}
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static void exe_add_tsk(struct taskstats *stats, struct task_struct *tsk)
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{
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/* No idea if I'm allowed to access that here, now. */
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struct file *exe_file = get_task_exe_file(tsk);
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if (exe_file) {
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/* Following cp_new_stat64() in stat.c . */
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stats->ac_exe_dev =
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huge_encode_dev(exe_file->f_inode->i_sb->s_dev);
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stats->ac_exe_inode = exe_file->f_inode->i_ino;
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fput(exe_file);
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} else {
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stats->ac_exe_dev = 0;
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stats->ac_exe_inode = 0;
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}
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}
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static void fill_stats(struct user_namespace *user_ns,
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struct pid_namespace *pid_ns,
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struct task_struct *tsk, struct taskstats *stats)
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@ -175,6 +193,9 @@ static void fill_stats(struct user_namespace *user_ns,
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/* fill in extended acct fields */
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xacct_add_tsk(stats, tsk);
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/* add executable info */
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exe_add_tsk(stats, tsk);
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}
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static int fill_stats_for_pid(pid_t pid, struct taskstats *stats)
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@ -620,6 +641,8 @@ void taskstats_exit(struct task_struct *tsk, int group_dead)
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goto err;
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fill_stats(&init_user_ns, &init_pid_ns, tsk, stats);
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if (group_dead)
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stats->ac_flag |= AGROUP;
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/*
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* Doesn't matter if tsk is the leader or the last group member leaving
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@ -23,15 +23,20 @@ void bacct_add_tsk(struct user_namespace *user_ns,
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{
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const struct cred *tcred;
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u64 utime, stime, utimescaled, stimescaled;
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u64 delta;
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u64 now_ns, delta;
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time64_t btime;
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BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN);
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/* calculate task elapsed time in nsec */
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delta = ktime_get_ns() - tsk->start_time;
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now_ns = ktime_get_ns();
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/* store whole group time first */
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delta = now_ns - tsk->group_leader->start_time;
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/* Convert to micro seconds */
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do_div(delta, NSEC_PER_USEC);
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stats->ac_tgetime = delta;
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delta = now_ns - tsk->start_time;
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do_div(delta, NSEC_PER_USEC);
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stats->ac_etime = delta;
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/* Convert to seconds for btime (note y2106 limit) */
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btime = ktime_get_real_seconds() - div_u64(delta, USEC_PER_SEC);
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@ -51,6 +56,7 @@ void bacct_add_tsk(struct user_namespace *user_ns,
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stats->ac_nice = task_nice(tsk);
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stats->ac_sched = tsk->policy;
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stats->ac_pid = task_pid_nr_ns(tsk, pid_ns);
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stats->ac_tgid = task_tgid_nr_ns(tsk, pid_ns);
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rcu_read_lock();
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tcred = __task_cred(tsk);
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stats->ac_uid = from_kuid_munged(user_ns, tcred->uid);
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1
tools/accounting/.gitignore
vendored
1
tools/accounting/.gitignore
vendored
@ -1,2 +1,3 @@
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# SPDX-License-Identifier: GPL-2.0-only
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getdelays
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procacct
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@ -2,7 +2,7 @@
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CC := $(CROSS_COMPILE)gcc
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CFLAGS := -I../../usr/include
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PROGS := getdelays
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PROGS := getdelays procacct
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all: $(PROGS)
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417
tools/accounting/procacct.c
Normal file
417
tools/accounting/procacct.c
Normal file
@ -0,0 +1,417 @@
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// SPDX-License-Identifier: GPL-2.0
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/* procacct.c
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*
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* Demonstrator of fetching resource data on task exit, as a way
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* to accumulate accurate program resource usage statistics, without
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* prior identification of the programs. For that, the fields for
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* device and inode of the program executable binary file are also
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* extracted in addition to the command string.
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*
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* The TGID together with the PID and the AGROUP flag allow
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* identification of threads in a process and single-threaded processes.
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* The ac_tgetime field gives proper whole-process walltime.
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*
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* Written (changed) by Thomas Orgis, University of Hamburg in 2022
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*
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* This is a cheap derivation (inheriting the style) of getdelays.c:
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*
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* Utility to get per-pid and per-tgid delay accounting statistics
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* Also illustrates usage of the taskstats interface
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*
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* Copyright (C) Shailabh Nagar, IBM Corp. 2005
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* Copyright (C) Balbir Singh, IBM Corp. 2006
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* Copyright (c) Jay Lan, SGI. 2006
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <unistd.h>
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#include <poll.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <sys/wait.h>
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#include <signal.h>
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#include <linux/genetlink.h>
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#include <linux/acct.h>
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#include <linux/taskstats.h>
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#include <linux/kdev_t.h>
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/*
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* Generic macros for dealing with netlink sockets. Might be duplicated
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* elsewhere. It is recommended that commercial grade applications use
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* libnl or libnetlink and use the interfaces provided by the library
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*/
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#define GENLMSG_DATA(glh) ((void *)(NLMSG_DATA(glh) + GENL_HDRLEN))
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#define GENLMSG_PAYLOAD(glh) (NLMSG_PAYLOAD(glh, 0) - GENL_HDRLEN)
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#define NLA_DATA(na) ((void *)((char *)(na) + NLA_HDRLEN))
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#define NLA_PAYLOAD(len) (len - NLA_HDRLEN)
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#define err(code, fmt, arg...) \
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do { \
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fprintf(stderr, fmt, ##arg); \
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exit(code); \
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} while (0)
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int rcvbufsz;
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char name[100];
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int dbg;
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int print_delays;
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int print_io_accounting;
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int print_task_context_switch_counts;
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#define PRINTF(fmt, arg...) { \
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if (dbg) { \
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printf(fmt, ##arg); \
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} \
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}
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/* Maximum size of response requested or message sent */
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#define MAX_MSG_SIZE 1024
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/* Maximum number of cpus expected to be specified in a cpumask */
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#define MAX_CPUS 32
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struct msgtemplate {
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struct nlmsghdr n;
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struct genlmsghdr g;
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char buf[MAX_MSG_SIZE];
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};
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char cpumask[100+6*MAX_CPUS];
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static void usage(void)
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{
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fprintf(stderr, "procacct [-v] [-w logfile] [-r bufsize] [-m cpumask]\n");
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fprintf(stderr, " -v: debug on\n");
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}
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/*
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* Create a raw netlink socket and bind
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*/
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static int create_nl_socket(int protocol)
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{
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int fd;
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struct sockaddr_nl local;
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fd = socket(AF_NETLINK, SOCK_RAW, protocol);
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if (fd < 0)
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return -1;
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if (rcvbufsz)
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if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF,
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&rcvbufsz, sizeof(rcvbufsz)) < 0) {
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fprintf(stderr, "Unable to set socket rcv buf size to %d\n",
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rcvbufsz);
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goto error;
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}
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memset(&local, 0, sizeof(local));
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local.nl_family = AF_NETLINK;
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if (bind(fd, (struct sockaddr *) &local, sizeof(local)) < 0)
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goto error;
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return fd;
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error:
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close(fd);
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return -1;
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}
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static int send_cmd(int sd, __u16 nlmsg_type, __u32 nlmsg_pid,
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__u8 genl_cmd, __u16 nla_type,
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void *nla_data, int nla_len)
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{
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struct nlattr *na;
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struct sockaddr_nl nladdr;
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int r, buflen;
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char *buf;
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struct msgtemplate msg;
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msg.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
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msg.n.nlmsg_type = nlmsg_type;
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msg.n.nlmsg_flags = NLM_F_REQUEST;
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msg.n.nlmsg_seq = 0;
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msg.n.nlmsg_pid = nlmsg_pid;
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msg.g.cmd = genl_cmd;
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msg.g.version = 0x1;
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na = (struct nlattr *) GENLMSG_DATA(&msg);
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na->nla_type = nla_type;
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na->nla_len = nla_len + 1 + NLA_HDRLEN;
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memcpy(NLA_DATA(na), nla_data, nla_len);
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msg.n.nlmsg_len += NLMSG_ALIGN(na->nla_len);
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buf = (char *) &msg;
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buflen = msg.n.nlmsg_len;
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memset(&nladdr, 0, sizeof(nladdr));
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nladdr.nl_family = AF_NETLINK;
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while ((r = sendto(sd, buf, buflen, 0, (struct sockaddr *) &nladdr,
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sizeof(nladdr))) < buflen) {
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if (r > 0) {
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buf += r;
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buflen -= r;
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} else if (errno != EAGAIN)
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return -1;
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}
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return 0;
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}
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/*
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* Probe the controller in genetlink to find the family id
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* for the TASKSTATS family
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*/
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static int get_family_id(int sd)
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{
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struct {
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struct nlmsghdr n;
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struct genlmsghdr g;
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char buf[256];
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} ans;
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int id = 0, rc;
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struct nlattr *na;
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int rep_len;
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strcpy(name, TASKSTATS_GENL_NAME);
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rc = send_cmd(sd, GENL_ID_CTRL, getpid(), CTRL_CMD_GETFAMILY,
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CTRL_ATTR_FAMILY_NAME, (void *)name,
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strlen(TASKSTATS_GENL_NAME)+1);
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if (rc < 0)
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return 0; /* sendto() failure? */
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rep_len = recv(sd, &ans, sizeof(ans), 0);
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if (ans.n.nlmsg_type == NLMSG_ERROR ||
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(rep_len < 0) || !NLMSG_OK((&ans.n), rep_len))
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return 0;
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na = (struct nlattr *) GENLMSG_DATA(&ans);
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na = (struct nlattr *) ((char *) na + NLA_ALIGN(na->nla_len));
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if (na->nla_type == CTRL_ATTR_FAMILY_ID)
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id = *(__u16 *) NLA_DATA(na);
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return id;
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}
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#define average_ms(t, c) (t / 1000000ULL / (c ? c : 1))
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static void print_procacct(struct taskstats *t)
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{
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/* First letter: T is a mere thread, G the last in a group, U unknown. */
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printf(
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"%c pid=%lu tgid=%lu uid=%lu wall=%llu gwall=%llu cpu=%llu vmpeak=%llu rsspeak=%llu dev=%lu:%lu inode=%llu comm=%s\n"
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, t->version >= 12 ? (t->ac_flag & AGROUP ? 'P' : 'T') : '?'
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, (unsigned long)t->ac_pid
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, (unsigned long)(t->version >= 12 ? t->ac_tgid : 0)
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, (unsigned long)t->ac_uid
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, (unsigned long long)t->ac_etime
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, (unsigned long long)(t->version >= 12 ? t->ac_tgetime : 0)
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, (unsigned long long)(t->ac_utime+t->ac_stime)
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, (unsigned long long)t->hiwater_vm
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, (unsigned long long)t->hiwater_rss
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, (unsigned long)(t->version >= 12 ? MAJOR(t->ac_exe_dev) : 0)
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, (unsigned long)(t->version >= 12 ? MINOR(t->ac_exe_dev) : 0)
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, (unsigned long long)(t->version >= 12 ? t->ac_exe_inode : 0)
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, t->ac_comm
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);
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}
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void handle_aggr(int mother, struct nlattr *na, int fd)
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{
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int aggr_len = NLA_PAYLOAD(na->nla_len);
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int len2 = 0;
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pid_t rtid = 0;
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na = (struct nlattr *) NLA_DATA(na);
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while (len2 < aggr_len) {
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switch (na->nla_type) {
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case TASKSTATS_TYPE_PID:
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rtid = *(int *) NLA_DATA(na);
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PRINTF("PID\t%d\n", rtid);
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break;
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case TASKSTATS_TYPE_TGID:
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rtid = *(int *) NLA_DATA(na);
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PRINTF("TGID\t%d\n", rtid);
|
||||
break;
|
||||
case TASKSTATS_TYPE_STATS:
|
||||
if (mother == TASKSTATS_TYPE_AGGR_PID)
|
||||
print_procacct((struct taskstats *) NLA_DATA(na));
|
||||
if (fd) {
|
||||
if (write(fd, NLA_DATA(na), na->nla_len) < 0)
|
||||
err(1, "write error\n");
|
||||
}
|
||||
break;
|
||||
case TASKSTATS_TYPE_NULL:
|
||||
break;
|
||||
default:
|
||||
fprintf(stderr, "Unknown nested nla_type %d\n",
|
||||
na->nla_type);
|
||||
break;
|
||||
}
|
||||
len2 += NLA_ALIGN(na->nla_len);
|
||||
na = (struct nlattr *)((char *)na +
|
||||
NLA_ALIGN(na->nla_len));
|
||||
}
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[])
|
||||
{
|
||||
int c, rc, rep_len, aggr_len, len2;
|
||||
int cmd_type = TASKSTATS_CMD_ATTR_UNSPEC;
|
||||
__u16 id;
|
||||
__u32 mypid;
|
||||
|
||||
struct nlattr *na;
|
||||
int nl_sd = -1;
|
||||
int len = 0;
|
||||
pid_t tid = 0;
|
||||
|
||||
int fd = 0;
|
||||
int write_file = 0;
|
||||
int maskset = 0;
|
||||
char *logfile = NULL;
|
||||
int containerset = 0;
|
||||
char *containerpath = NULL;
|
||||
int cfd = 0;
|
||||
int forking = 0;
|
||||
sigset_t sigset;
|
||||
|
||||
struct msgtemplate msg;
|
||||
|
||||
while (!forking) {
|
||||
c = getopt(argc, argv, "m:vr:");
|
||||
if (c < 0)
|
||||
break;
|
||||
|
||||
switch (c) {
|
||||
case 'w':
|
||||
logfile = strdup(optarg);
|
||||
printf("write to file %s\n", logfile);
|
||||
write_file = 1;
|
||||
break;
|
||||
case 'r':
|
||||
rcvbufsz = atoi(optarg);
|
||||
printf("receive buf size %d\n", rcvbufsz);
|
||||
if (rcvbufsz < 0)
|
||||
err(1, "Invalid rcv buf size\n");
|
||||
break;
|
||||
case 'm':
|
||||
strncpy(cpumask, optarg, sizeof(cpumask));
|
||||
cpumask[sizeof(cpumask) - 1] = '\0';
|
||||
maskset = 1;
|
||||
break;
|
||||
case 'v':
|
||||
printf("debug on\n");
|
||||
dbg = 1;
|
||||
break;
|
||||
default:
|
||||
usage();
|
||||
exit(-1);
|
||||
}
|
||||
}
|
||||
if (!maskset) {
|
||||
maskset = 1;
|
||||
strncpy(cpumask, "1", sizeof(cpumask));
|
||||
cpumask[sizeof(cpumask) - 1] = '\0';
|
||||
}
|
||||
printf("cpumask %s maskset %d\n", cpumask, maskset);
|
||||
|
||||
if (write_file) {
|
||||
fd = open(logfile, O_WRONLY | O_CREAT | O_TRUNC, 0644);
|
||||
if (fd == -1) {
|
||||
perror("Cannot open output file\n");
|
||||
exit(1);
|
||||
}
|
||||
}
|
||||
|
||||
nl_sd = create_nl_socket(NETLINK_GENERIC);
|
||||
if (nl_sd < 0)
|
||||
err(1, "error creating Netlink socket\n");
|
||||
|
||||
mypid = getpid();
|
||||
id = get_family_id(nl_sd);
|
||||
if (!id) {
|
||||
fprintf(stderr, "Error getting family id, errno %d\n", errno);
|
||||
goto err;
|
||||
}
|
||||
PRINTF("family id %d\n", id);
|
||||
|
||||
if (maskset) {
|
||||
rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
|
||||
TASKSTATS_CMD_ATTR_REGISTER_CPUMASK,
|
||||
&cpumask, strlen(cpumask) + 1);
|
||||
PRINTF("Sent register cpumask, retval %d\n", rc);
|
||||
if (rc < 0) {
|
||||
fprintf(stderr, "error sending register cpumask\n");
|
||||
goto err;
|
||||
}
|
||||
}
|
||||
|
||||
do {
|
||||
rep_len = recv(nl_sd, &msg, sizeof(msg), 0);
|
||||
PRINTF("received %d bytes\n", rep_len);
|
||||
|
||||
if (rep_len < 0) {
|
||||
fprintf(stderr, "nonfatal reply error: errno %d\n",
|
||||
errno);
|
||||
continue;
|
||||
}
|
||||
if (msg.n.nlmsg_type == NLMSG_ERROR ||
|
||||
!NLMSG_OK((&msg.n), rep_len)) {
|
||||
struct nlmsgerr *err = NLMSG_DATA(&msg);
|
||||
|
||||
fprintf(stderr, "fatal reply error, errno %d\n",
|
||||
err->error);
|
||||
goto done;
|
||||
}
|
||||
|
||||
PRINTF("nlmsghdr size=%zu, nlmsg_len=%d, rep_len=%d\n",
|
||||
sizeof(struct nlmsghdr), msg.n.nlmsg_len, rep_len);
|
||||
|
||||
|
||||
rep_len = GENLMSG_PAYLOAD(&msg.n);
|
||||
|
||||
na = (struct nlattr *) GENLMSG_DATA(&msg);
|
||||
len = 0;
|
||||
while (len < rep_len) {
|
||||
len += NLA_ALIGN(na->nla_len);
|
||||
int mother = na->nla_type;
|
||||
|
||||
PRINTF("mother=%i\n", mother);
|
||||
switch (na->nla_type) {
|
||||
case TASKSTATS_TYPE_AGGR_PID:
|
||||
case TASKSTATS_TYPE_AGGR_TGID:
|
||||
/* For nested attributes, na follows */
|
||||
handle_aggr(mother, na, fd);
|
||||
break;
|
||||
default:
|
||||
fprintf(stderr, "Unexpected nla_type %d\n",
|
||||
na->nla_type);
|
||||
case TASKSTATS_TYPE_NULL:
|
||||
break;
|
||||
}
|
||||
na = (struct nlattr *) (GENLMSG_DATA(&msg) + len);
|
||||
}
|
||||
} while (1);
|
||||
done:
|
||||
if (maskset) {
|
||||
rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
|
||||
TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK,
|
||||
&cpumask, strlen(cpumask) + 1);
|
||||
printf("Sent deregister mask, retval %d\n", rc);
|
||||
if (rc < 0)
|
||||
err(rc, "error sending deregister cpumask\n");
|
||||
}
|
||||
err:
|
||||
close(nl_sd);
|
||||
if (fd)
|
||||
close(fd);
|
||||
if (cfd)
|
||||
close(cfd);
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user