tools/rv: Add in-kernel monitor interface
Add the ability to control and trace in-kernel monitors. This is
a generic interface, it will check for existing monitors and enable
standard setup, like enabling reactors.
For example:
# rv list
wip wakeup in preemptive per-cpu testing monitor. [OFF]
wwnr wakeup while not running per-task testing model. [OFF]
# rv mon wwnr --help
rv version 6.1.0-rc4: help
usage: rv mon wwnr [-h] [-q] [-r reactor] [-s] [-v]
-h/--help: print this menu and the reactor list
-r/--reactor 'reactor': enables the 'reactor'
-s/--self: when tracing (-t), also trace rv command
-t/--trace: trace monitor's event
-v/--verbose: print debug messages
available reactors: nop printk panic
# rv mon wwnr --trace
<TASK>-PID [CPU] TYPE ID STATE x EVENT -> NEXT_STATE FINAL
| | | | | | | | |
rv-3613 [001] event 3613 running x switch_out -> not_running Y
sshd-1248 [005] event 1248 running x switch_out -> not_running Y
<idle>-0 [005] event 71 not_running x wakeup -> not_running Y
<idle>-0 [005] event 71 not_running x switch_in -> running N
kcompactd0-71 [005] event 71 running x switch_out -> not_running Y
<idle>-0 [000] event 860 not_running x wakeup -> not_running Y
<idle>-0 [000] event 860 not_running x switch_in -> running N
systemd-oomd-860 [000] event 860 running x switch_out -> not_running Y
<idle>-0 [000] event 860 not_running x wakeup -> not_running Y
<idle>-0 [000] event 860 not_running x switch_in -> running N
systemd-oomd-860 [000] event 860 running x switch_out -> not_running Y
<idle>-0 [005] event 71 not_running x wakeup -> not_running Y
<idle>-0 [005] event 71 not_running x switch_in -> running N
kcompactd0-71 [005] event 71 running x switch_out -> not_running Y
<idle>-0 [000] event 860 not_running x wakeup -> not_running Y
<idle>-0 [000] event 860 not_running x switch_in -> running N
systemd-oomd-860 [000] event 860 running x switch_out -> not_running Y
<idle>-0 [001] event 3613 not_running x wakeup -> not_running Y
Link: https://lkml.kernel.org/r/1e57547e3acadda6e23949b2672c89e76ec2ec42.1668180100.git.bristot@kernel.org
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Daniel Bristot de Oliveira
Steven Rostedt (Google)
parent
4bc4b131d4
commit
6d60f89691
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@ -0,0 +1,3 @@
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// SPDX-License-Identifier: GPL-2.0
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int ikm_list_monitors(void);
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int ikm_run_monitor(char *monitor, int argc, char **argv);
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@ -0,0 +1,698 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* in kernel monitor support: allows rv to control in-kernel monitors.
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*
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* Copyright (C) 2022 Red Hat Inc, Daniel Bristot de Oliveira <bristot@kernel.org>
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*/
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#include <getopt.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <trace.h>
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#include <utils.h>
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#include <rv.h>
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static int config_has_id;
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static int config_my_pid;
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static int config_trace;
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static char *config_initial_reactor;
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static char *config_reactor;
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/*
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* __ikm_read_enable - reads monitor's enable status
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*
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* __does not log errors.
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*
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* Returns the current status, or -1 if the monitor does not exist,
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* __hence not logging errors.
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*/
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static int __ikm_read_enable(char *monitor_name)
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{
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char path[MAX_PATH];
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long long enabled;
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int retval;
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snprintf(path, MAX_PATH, "rv/monitors/%s/enable", monitor_name);
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retval = tracefs_instance_file_read_number(NULL, path, &enabled);
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if (retval < 0)
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return -1;
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return enabled;
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}
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/*
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* ikm_read_enable - reads monitor's enable status
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*
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* Returns the current status, or -1 on error.
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*/
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static int ikm_read_enable(char *monitor_name)
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{
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int enabled;
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enabled = __ikm_read_enable(monitor_name);
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if (enabled < 0) {
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err_msg("ikm: fail read enabled: %d\n", enabled);
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return -1;
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}
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debug_msg("ikm: read enabled: %d\n", enabled);
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return enabled;
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}
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/*
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* ikm_write_enable - write to the monitor's enable file
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*
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* Return the number of bytes written, -1 on error.
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*/
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static int ikm_write_enable(char *monitor_name, char *enable_disable)
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{
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char path[MAX_PATH];
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int retval;
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debug_msg("ikm: writing enabled: %s\n", enable_disable);
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snprintf(path, MAX_PATH, "rv/monitors/%s/enable", monitor_name);
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retval = tracefs_instance_file_write(NULL, path, enable_disable);
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if (retval < strlen(enable_disable)) {
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err_msg("ikm: writing enabled: %s\n", enable_disable);
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return -1;
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}
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return retval;
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}
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/*
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* ikm_enable - enable a monitor
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*
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* Returns -1 on failure. Success otherwise.
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*/
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static int ikm_enable(char *monitor_name)
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{
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return ikm_write_enable(monitor_name, "1");
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}
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/*
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* ikm_disable - disable a monitor
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*
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* Returns -1 on failure. Success otherwise.
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*/
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static int ikm_disable(char *monitor_name)
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{
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return ikm_write_enable(monitor_name, "0");
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}
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/*
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* ikm_read_desc - read monitors' description
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*
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* Return a dynamically allocated string with the monitor's
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* description, NULL otherwise.
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*/
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static char *ikm_read_desc(char *monitor_name)
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{
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char path[MAX_PATH];
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char *desc;
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snprintf(path, MAX_PATH, "rv/monitors/%s/desc", monitor_name);
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desc = tracefs_instance_file_read(NULL, path, NULL);
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if (!desc) {
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err_msg("ikm: error reading monitor %s desc\n", monitor_name);
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return NULL;
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}
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*strstr(desc, "\n") = '\0';
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return desc;
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}
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/*
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* ikm_fill_monitor_definition - fill monitor's definition
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*
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* Returns -1 on error, 0 otherwise.
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*/
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static int ikm_fill_monitor_definition(char *name, struct monitor *ikm)
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{
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int enabled;
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char *desc;
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enabled = ikm_read_enable(name);
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if (enabled < 0) {
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err_msg("ikm: monitor %s fail to read enable file, bug?\n", name);
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return -1;
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}
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desc = ikm_read_desc(name);
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if (!desc) {
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err_msg("ikm: monitor %s does not have desc file, bug?\n", name);
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return -1;
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}
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strncpy(ikm->name, name, MAX_DA_NAME_LEN);
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ikm->enabled = enabled;
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strncpy(ikm->desc, desc, MAX_DESCRIPTION);
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free(desc);
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return 0;
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}
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/*
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* ikm_write_reactor - switch the reactor to *reactor
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*
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* Return the number or characters written, -1 on error.
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*/
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static int ikm_write_reactor(char *monitor_name, char *reactor)
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{
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char path[MAX_PATH];
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int retval;
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snprintf(path, MAX_PATH, "rv/monitors/%s/reactors", monitor_name);
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retval = tracefs_instance_file_write(NULL, path, reactor);
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debug_msg("ikm: write \"%s\" reactors: %d\n", reactor, retval);
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return retval;
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}
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/*
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* ikm_read_reactor - read the reactors file
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*
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* Returns a dynamically allocated string with monitor's
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* available reactors, or NULL on error.
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*/
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static char *ikm_read_reactor(char *monitor_name)
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{
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char path[MAX_PATH];
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char *reactors;
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snprintf(path, MAX_PATH, "rv/monitors/%s/reactors", monitor_name);
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reactors = tracefs_instance_file_read(NULL, path, NULL);
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if (!reactors) {
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err_msg("ikm: fail reading monitor's %s reactors file\n", monitor_name);
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return NULL;
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}
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return reactors;
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}
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/*
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* ikm_get_current_reactor - get the current enabled reactor
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*
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* Reads the reactors file and find the currently enabled
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* [reactor].
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*
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* Returns a dynamically allocated memory with the current
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* reactor. NULL otherwise.
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*/
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static char *ikm_get_current_reactor(char *monitor_name)
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{
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char *reactors = ikm_read_reactor(monitor_name);
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char *start;
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char *end;
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char *curr_reactor;
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if (!reactors)
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return NULL;
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start = strstr(reactors, "[");
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if (!start)
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goto out_free;
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start++;
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end = strstr(start, "]");
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if (!end)
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goto out_free;
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*end = '\0';
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curr_reactor = calloc(strlen(start) + 1, sizeof(char));
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if (!curr_reactor)
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goto out_free;
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strncpy(curr_reactor, start, strlen(start));
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debug_msg("ikm: read current reactor %s\n", curr_reactor);
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out_free:
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free(reactors);
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return curr_reactor;
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}
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static int ikm_has_id(char *monitor_name)
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{
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char path[MAX_PATH];
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char *format;
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int has_id;
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snprintf(path, MAX_PATH, "events/rv/event_%s/format", monitor_name);
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format = tracefs_instance_file_read(NULL, path, NULL);
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if (!format) {
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err_msg("ikm: fail reading monitor's %s format event file\n", monitor_name);
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return -1;
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}
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/* print fmt: "%d: %s x %s -> %s %s", REC->id, ... */
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has_id = !!strstr(format, "REC->id");
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debug_msg("ikm: monitor %s has id: %s\n", monitor_name, has_id ? "yes" : "no");
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free(format);
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return has_id;
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}
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/**
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* ikm_list_monitors - list all available monitors
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*
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* Returns 0 on success, -1 otherwise.
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*/
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int ikm_list_monitors(void)
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{
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char *available_monitors;
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struct monitor ikm;
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char *curr, *next;
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int retval;
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available_monitors = tracefs_instance_file_read(NULL, "rv/available_monitors", NULL);
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if (!available_monitors) {
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err_msg("ikm: available monitors is not available, is CONFIG_RV enabled?\n");
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return -1;
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}
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curr = available_monitors;
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do {
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next = strstr(curr, "\n");
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*next = '\0';
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retval = ikm_fill_monitor_definition(curr, &ikm);
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if (retval)
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err_msg("ikm: error reading %d in kernel monitor, skipping\n", curr);
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printf("%-24s %s %s\n", ikm.name, ikm.desc, ikm.enabled ? "[ON]" : "[OFF]");
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curr = ++next;
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} while (strlen(curr));
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free(available_monitors);
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return 0;
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}
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static void ikm_print_header(struct trace_seq *s)
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{
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trace_seq_printf(s, "%16s-%-8s %5s %5s ", "<TASK>", "PID", "[CPU]", "TYPE");
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if (config_has_id)
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trace_seq_printf(s, "%8s ", "ID");
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trace_seq_printf(s, "%24s x %-24s -> %-24s %s\n",
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"STATE",
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"EVENT",
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"NEXT_STATE",
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"FINAL");
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trace_seq_printf(s, "%16s %-8s %5s %5s ", " | ", " | ", " | ", " | ");
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if (config_has_id)
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trace_seq_printf(s, "%8s ", " | ");
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trace_seq_printf(s, "%24s %-24s %-24s %s\n",
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" | ",
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" | ",
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" | ",
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"|");
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}
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/*
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* ikm_event_handler - callback to handle event events
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*
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* Called any time a rv:"monitor"_event events is generated.
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* It parses and print event.
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*/
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static int
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ikm_event_handler(struct trace_seq *s, struct tep_record *record,
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struct tep_event *trace_event, void *context)
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{
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/* if needed: struct trace_instance *inst = context; */
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char *state, *event, *next_state;
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unsigned long long final_state;
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unsigned long long pid;
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unsigned long long id;
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int cpu = record->cpu;
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int val;
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if (config_has_id)
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tep_get_field_val(s, trace_event, "id", record, &id, 1);
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tep_get_common_field_val(s, trace_event, "common_pid", record, &pid, 1);
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if (config_has_id && (config_my_pid == id))
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return 0;
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else if (config_my_pid && (config_my_pid == pid))
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return 0;
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tep_print_event(trace_event->tep, s, record, "%16s-%-8d ", TEP_PRINT_COMM, TEP_PRINT_PID);
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trace_seq_printf(s, "[%.3d] event ", cpu);
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if (config_has_id)
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trace_seq_printf(s, "%8llu ", id);
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state = tep_get_field_raw(s, trace_event, "state", record, &val, 0);
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event = tep_get_field_raw(s, trace_event, "event", record, &val, 0);
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next_state = tep_get_field_raw(s, trace_event, "next_state", record, &val, 0);
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tep_get_field_val(s, trace_event, "final_state", record, &final_state, 1);
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trace_seq_printf(s, "%24s x %-24s -> %-24s %s\n",
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state,
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event,
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next_state,
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final_state ? "Y" : "N");
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trace_seq_do_printf(s);
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trace_seq_reset(s);
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return 0;
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}
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/*
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* ikm_error_handler - callback to handle error events
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*
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* Called any time a rv:"monitor"_errors events is generated.
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* It parses and print event.
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*/
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static int
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ikm_error_handler(struct trace_seq *s, struct tep_record *record,
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struct tep_event *trace_event, void *context)
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{
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unsigned long long pid, id;
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int cpu = record->cpu;
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char *state, *event;
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int val;
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if (config_has_id)
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tep_get_field_val(s, trace_event, "id", record, &id, 1);
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tep_get_common_field_val(s, trace_event, "common_pid", record, &pid, 1);
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if (config_has_id && config_my_pid == id)
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return 0;
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else if (config_my_pid == pid)
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return 0;
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trace_seq_printf(s, "%8lld [%03d] error ", pid, cpu);
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if (config_has_id)
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trace_seq_printf(s, "%8llu ", id);
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state = tep_get_field_raw(s, trace_event, "state", record, &val, 0);
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event = tep_get_field_raw(s, trace_event, "event", record, &val, 0);
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trace_seq_printf(s, "%24s x %s\n", state, event);
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trace_seq_do_printf(s);
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trace_seq_reset(s);
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return 0;
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}
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/*
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* ikm_setup_trace_instance - set up a tracing instance to collect data
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*
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* Create a trace instance, enable rv: events and enable the trace.
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*
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* Returns the trace_instance * with all set, NULL otherwise.
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*/
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static struct trace_instance *ikm_setup_trace_instance(char *monitor_name)
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{
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char event[MAX_DA_NAME_LEN + 7]; /* max(error_,event_) + '0' = 7 */
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struct trace_instance *inst;
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int retval;
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if (!config_trace)
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return NULL;
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config_has_id = ikm_has_id(monitor_name);
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if (config_has_id < 0) {
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err_msg("ikm: failed to read monitor %s event format\n", monitor_name);
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goto out_err;
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}
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/* alloc data */
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inst = calloc(1, sizeof(*inst));
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if (!inst) {
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err_msg("ikm: failed to allocate trace instance");
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goto out_err;
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}
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retval = trace_instance_init(inst, monitor_name);
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if (retval)
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goto out_free;
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/* enable events */
|
||||
snprintf(event, sizeof(event), "event_%s", monitor_name);
|
||||
retval = tracefs_event_enable(inst->inst, "rv", event);
|
||||
if (retval)
|
||||
goto out_inst;
|
||||
|
||||
tep_register_event_handler(inst->tep, -1, "rv", event,
|
||||
ikm_event_handler, NULL);
|
||||
|
||||
snprintf(event, sizeof(event), "error_%s", monitor_name);
|
||||
retval = tracefs_event_enable(inst->inst, "rv", event);
|
||||
if (retval)
|
||||
goto out_inst;
|
||||
|
||||
tep_register_event_handler(inst->tep, -1, "rv", event,
|
||||
ikm_error_handler, NULL);
|
||||
|
||||
/* ready to enable */
|
||||
tracefs_trace_on(inst->inst);
|
||||
|
||||
return inst;
|
||||
|
||||
out_inst:
|
||||
trace_instance_destroy(inst);
|
||||
out_free:
|
||||
free(inst);
|
||||
out_err:
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/**
|
||||
* ikm_destroy_trace_instance - destroy a previously created instance
|
||||
*/
|
||||
static void ikm_destroy_trace_instance(struct trace_instance *inst)
|
||||
{
|
||||
if (!inst)
|
||||
return;
|
||||
|
||||
trace_instance_destroy(inst);
|
||||
free(inst);
|
||||
}
|
||||
|
||||
/*
|
||||
* ikm_usage_print_reactors - print all available reactors, one per line.
|
||||
*/
|
||||
static void ikm_usage_print_reactors(void)
|
||||
{
|
||||
char *reactors = tracefs_instance_file_read(NULL, "rv/available_reactors", NULL);
|
||||
char *start, *end;
|
||||
|
||||
if (!reactors)
|
||||
return;
|
||||
|
||||
fprintf(stderr, " available reactors:");
|
||||
|
||||
start = reactors;
|
||||
end = strstr(start, "\n");
|
||||
|
||||
while (end) {
|
||||
*end = '\0';
|
||||
|
||||
fprintf(stderr, " %s", start);
|
||||
|
||||
start = ++end;
|
||||
end = strstr(start, "\n");
|
||||
};
|
||||
|
||||
fprintf(stderr, "\n");
|
||||
}
|
||||
/*
|
||||
* ikm_usage - print usage
|
||||
*/
|
||||
static void ikm_usage(int exit_val, char *monitor_name, const char *fmt, ...)
|
||||
{
|
||||
|
||||
char message[1024];
|
||||
va_list ap;
|
||||
int i;
|
||||
|
||||
static const char *const usage[] = {
|
||||
"",
|
||||
" -h/--help: print this menu and the reactor list",
|
||||
" -r/--reactor 'reactor': enables the 'reactor'",
|
||||
" -s/--self: when tracing (-t), also trace rv command",
|
||||
" -t/--trace: trace monitor's event",
|
||||
" -v/--verbose: print debug messages",
|
||||
"",
|
||||
NULL,
|
||||
};
|
||||
|
||||
va_start(ap, fmt);
|
||||
vsnprintf(message, sizeof(message), fmt, ap);
|
||||
va_end(ap);
|
||||
|
||||
fprintf(stderr, " %s\n", message);
|
||||
|
||||
fprintf(stderr, "\n usage: rv mon %s [-h] [-q] [-r reactor] [-s] [-v]", monitor_name);
|
||||
|
||||
for (i = 0; usage[i]; i++)
|
||||
fprintf(stderr, "%s\n", usage[i]);
|
||||
|
||||
ikm_usage_print_reactors();
|
||||
exit(exit_val);
|
||||
}
|
||||
|
||||
/*
|
||||
* parse_arguments - parse arguments and set config
|
||||
*/
|
||||
static int parse_arguments(char *monitor_name, int argc, char **argv)
|
||||
{
|
||||
int c, retval;
|
||||
|
||||
config_my_pid = getpid();
|
||||
|
||||
while (1) {
|
||||
static struct option long_options[] = {
|
||||
{"help", no_argument, 0, 'h'},
|
||||
{"reactor", required_argument, 0, 'r'},
|
||||
{"self", no_argument, 0, 's'},
|
||||
{"trace", no_argument, 0, 't'},
|
||||
{"verbose", no_argument, 0, 'v'},
|
||||
{0, 0, 0, 0}
|
||||
};
|
||||
|
||||
/* getopt_long stores the option index here. */
|
||||
int option_index = 0;
|
||||
|
||||
c = getopt_long(argc, argv, "hr:stv", long_options, &option_index);
|
||||
|
||||
/* detect the end of the options. */
|
||||
if (c == -1)
|
||||
break;
|
||||
|
||||
switch (c) {
|
||||
case 'h':
|
||||
ikm_usage(0, monitor_name, "help:");
|
||||
break;
|
||||
case 'r':
|
||||
config_reactor = optarg;
|
||||
break;
|
||||
case 's':
|
||||
config_my_pid = 0;
|
||||
break;
|
||||
case 't':
|
||||
config_trace = 1;
|
||||
break;
|
||||
case 'v':
|
||||
config_debug = 1;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (config_reactor) {
|
||||
config_initial_reactor = ikm_get_current_reactor(monitor_name);
|
||||
if (!config_initial_reactor)
|
||||
ikm_usage(1, monitor_name,
|
||||
"ikm: failed to read current reactor, are reactors enabled?");
|
||||
|
||||
retval = ikm_write_reactor(monitor_name, config_reactor);
|
||||
if (retval <= 0)
|
||||
ikm_usage(1, monitor_name,
|
||||
"ikm: failed to set %s reactor, is it available?",
|
||||
config_reactor);
|
||||
}
|
||||
|
||||
debug_msg("ikm: my pid is %d\n", config_my_pid);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* ikm_run_monitor - apply configs and run the monitor
|
||||
*
|
||||
* Returns 1 if a monitor was found an executed, 0 if no
|
||||
* monitors were found, or -1 on error.
|
||||
*/
|
||||
int ikm_run_monitor(char *monitor_name, int argc, char **argv)
|
||||
{
|
||||
struct trace_instance *inst = NULL;
|
||||
int retval;
|
||||
|
||||
/*
|
||||
* Check if monitor exists by seeing it is enabled.
|
||||
*/
|
||||
retval = __ikm_read_enable(monitor_name);
|
||||
if (retval < 0)
|
||||
return 0;
|
||||
|
||||
if (retval) {
|
||||
err_msg("ikm: monitor %s (in-kernel) is already enabled\n", monitor_name);
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* we should be good to go */
|
||||
retval = parse_arguments(monitor_name, argc, argv);
|
||||
if (retval)
|
||||
ikm_usage(1, monitor_name, "ikm: failed parsing arguments");
|
||||
|
||||
if (config_trace) {
|
||||
inst = ikm_setup_trace_instance(monitor_name);
|
||||
if (!inst)
|
||||
return -1;
|
||||
}
|
||||
|
||||
retval = ikm_enable(monitor_name);
|
||||
if (retval < 0)
|
||||
goto out_free_instance;
|
||||
|
||||
if (config_trace)
|
||||
ikm_print_header(inst->seq);
|
||||
|
||||
while (!should_stop()) {
|
||||
if (config_trace) {
|
||||
retval = tracefs_iterate_raw_events(inst->tep,
|
||||
inst->inst,
|
||||
NULL,
|
||||
0,
|
||||
collect_registered_events,
|
||||
inst);
|
||||
if (retval) {
|
||||
err_msg("ikm: error reading trace buffer\n");
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
sleep(1);
|
||||
}
|
||||
|
||||
ikm_disable(monitor_name);
|
||||
ikm_destroy_trace_instance(inst);
|
||||
|
||||
if (config_reactor && config_initial_reactor)
|
||||
ikm_write_reactor(monitor_name, config_initial_reactor);
|
||||
|
||||
return 1;
|
||||
|
||||
out_free_instance:
|
||||
ikm_destroy_trace_instance(inst);
|
||||
if (config_reactor && config_initial_reactor)
|
||||
ikm_write_reactor(monitor_name, config_initial_reactor);
|
||||
return -1;
|
||||
}
|
||||
|
|
@ -12,6 +12,7 @@
|
|||
|
||||
#include <trace.h>
|
||||
#include <utils.h>
|
||||
#include <in_kernel.h>
|
||||
|
||||
static int stop_session;
|
||||
|
||||
|
|
@ -63,6 +64,7 @@ static void rv_list(int argc, char **argv)
|
|||
exit(1);
|
||||
}
|
||||
|
||||
ikm_list_monitors();
|
||||
exit(0);
|
||||
}
|
||||
|
||||
|
|
@ -109,6 +111,7 @@ static void rv_mon(int argc, char **argv)
|
|||
* Call all possible monitor implementations, looking
|
||||
* for the [monitor].
|
||||
*/
|
||||
run += ikm_run_monitor(monitor_name, argc-1, &argv[1]);
|
||||
|
||||
if (!run)
|
||||
err_msg("rv: monitor %s does not exist\n", monitor_name);
|
||||
|
|
|
|||
Loading…
Reference in New Issue