#include <linux/reboot.h>
#include <linux/sysrq.h>
#include <linux/kbd_kern.h>
+#include <linux/proc_fs.h>
#include <linux/quotaops.h>
+#include <linux/perf_counter.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/suspend.h>
#include <linux/vt_kern.h>
#include <linux/workqueue.h>
#include <linux/kexec.h>
-#include <linux/irq.h>
+#include <linux/interrupt.h>
#include <linux/hrtimer.h>
#include <linux/oom.h>
}
static struct sysrq_key_op sysrq_loglevel_op = {
.handler = sysrq_handle_loglevel,
- .help_msg = "loglevel0-8",
+ .help_msg = "loglevel(0-9)",
.action_msg = "Changing Loglevel",
.enable_mask = SYSRQ_ENABLE_LOG,
};
static struct sysrq_key_op sysrq_show_timers_op = {
.handler = sysrq_handle_show_timers,
.help_msg = "show-all-timers(Q)",
- .action_msg = "Show Pending Timers",
+ .action_msg = "Show clockevent devices & pending hrtimers (no others)",
};
static void sysrq_handle_mountro(int key, struct tty_struct *tty)
static void sysrq_showregs_othercpus(struct work_struct *dummy)
{
- smp_call_function(showacpu, NULL, 0, 0);
+ smp_call_function(showacpu, NULL, 0);
}
static DECLARE_WORK(sysrq_showallcpus, sysrq_showregs_othercpus);
static struct sysrq_key_op sysrq_showallcpus_op = {
.handler = sysrq_handle_showallcpus,
- .help_msg = "aLlcpus",
+ .help_msg = "show-backtrace-all-active-cpus(L)",
.action_msg = "Show backtrace of all active CPUs",
.enable_mask = SYSRQ_ENABLE_DUMP,
};
struct pt_regs *regs = get_irq_regs();
if (regs)
show_regs(regs);
+ perf_counter_print_debug();
}
static struct sysrq_key_op sysrq_showregs_op = {
.handler = sysrq_handle_showregs,
- .help_msg = "showPc",
+ .help_msg = "show-registers(P)",
.action_msg = "Show Regs",
.enable_mask = SYSRQ_ENABLE_DUMP,
};
}
static struct sysrq_key_op sysrq_showstate_op = {
.handler = sysrq_handle_showstate,
- .help_msg = "showTasks",
+ .help_msg = "show-task-states(T)",
.action_msg = "Show State",
.enable_mask = SYSRQ_ENABLE_DUMP,
};
}
static struct sysrq_key_op sysrq_showstate_blocked_op = {
.handler = sysrq_handle_showstate_blocked,
- .help_msg = "shoW-blocked-tasks",
+ .help_msg = "show-blocked-tasks(W)",
.action_msg = "Show Blocked State",
.enable_mask = SYSRQ_ENABLE_DUMP,
};
+#ifdef CONFIG_TRACING
+#include <linux/ftrace.h>
+
+static void sysrq_ftrace_dump(int key, struct tty_struct *tty)
+{
+ ftrace_dump();
+}
+static struct sysrq_key_op sysrq_ftrace_dump_op = {
+ .handler = sysrq_ftrace_dump,
+ .help_msg = "dump-ftrace-buffer(Z)",
+ .action_msg = "Dump ftrace buffer",
+ .enable_mask = SYSRQ_ENABLE_DUMP,
+};
+#else
+#define sysrq_ftrace_dump_op (*(struct sysrq_key_op *)0)
+#endif
static void sysrq_handle_showmem(int key, struct tty_struct *tty)
{
}
static struct sysrq_key_op sysrq_showmem_op = {
.handler = sysrq_handle_showmem,
- .help_msg = "showMem",
+ .help_msg = "show-memory-usage(M)",
.action_msg = "Show Memory",
.enable_mask = SYSRQ_ENABLE_DUMP,
};
}
static struct sysrq_key_op sysrq_term_op = {
.handler = sysrq_handle_term,
- .help_msg = "tErm",
+ .help_msg = "terminate-all-tasks(E)",
.action_msg = "Terminate All Tasks",
.enable_mask = SYSRQ_ENABLE_SIGNAL,
};
}
static struct sysrq_key_op sysrq_moom_op = {
.handler = sysrq_handle_moom,
- .help_msg = "Full",
+ .help_msg = "memory-full-oom-kill(F)",
.action_msg = "Manual OOM execution",
+ .enable_mask = SYSRQ_ENABLE_SIGNAL,
+};
+
+#ifdef CONFIG_BLOCK
+static void sysrq_handle_thaw(int key, struct tty_struct *tty)
+{
+ emergency_thaw_all();
+}
+static struct sysrq_key_op sysrq_thaw_op = {
+ .handler = sysrq_handle_thaw,
+ .help_msg = "thaw-filesystems(J)",
+ .action_msg = "Emergency Thaw of all frozen filesystems",
+ .enable_mask = SYSRQ_ENABLE_SIGNAL,
};
+#endif
static void sysrq_handle_kill(int key, struct tty_struct *tty)
{
}
static struct sysrq_key_op sysrq_kill_op = {
.handler = sysrq_handle_kill,
- .help_msg = "kIll",
+ .help_msg = "kill-all-tasks(I)",
.action_msg = "Kill All Tasks",
.enable_mask = SYSRQ_ENABLE_SIGNAL,
};
}
static struct sysrq_key_op sysrq_unrt_op = {
.handler = sysrq_handle_unrt,
- .help_msg = "Nice",
+ .help_msg = "nice-all-RT-tasks(N)",
.action_msg = "Nice All RT Tasks",
.enable_mask = SYSRQ_ENABLE_RTNICE,
};
&sysrq_moom_op, /* f */
/* g: May be registered by ppc for kgdb */
NULL, /* g */
- NULL, /* h */
+ NULL, /* h - reserved for help */
&sysrq_kill_op, /* i */
+#ifdef CONFIG_BLOCK
+ &sysrq_thaw_op, /* j */
+#else
NULL, /* j */
+#endif
&sysrq_SAK_op, /* k */
#ifdef CONFIG_SMP
&sysrq_showallcpus_op, /* l */
&sysrq_showstate_blocked_op, /* w */
/* x: May be registered on ppc/powerpc for xmon */
NULL, /* x */
+ /* y: May be registered on sparc64 for global register dump */
NULL, /* y */
- NULL /* z */
+ &sysrq_ftrace_dump_op, /* z */
};
/* key2index calculation, -1 on invalid index */
unsigned long flags;
spin_lock_irqsave(&sysrq_key_table_lock, flags);
+ /*
+ * Raise the apparent loglevel to maximum so that the sysrq header
+ * is shown to provide the user with positive feedback. We do not
+ * simply emit this at KERN_EMERG as that would change message
+ * routing in the consumers of /proc/kmsg.
+ */
orig_log_level = console_loglevel;
console_loglevel = 7;
printk(KERN_INFO "SysRq : ");
return __sysrq_swap_key_ops(key, NULL, op_p);
}
EXPORT_SYMBOL(unregister_sysrq_key);
+
+#ifdef CONFIG_PROC_FS
+/*
+ * writing 'C' to /proc/sysrq-trigger is like sysrq-C
+ */
+static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ if (count) {
+ char c;
+
+ if (get_user(c, buf))
+ return -EFAULT;
+ __handle_sysrq(c, NULL, 0);
+ }
+ return count;
+}
+
+static const struct file_operations proc_sysrq_trigger_operations = {
+ .write = write_sysrq_trigger,
+};
+
+static int __init sysrq_init(void)
+{
+ proc_create("sysrq-trigger", S_IWUSR, NULL, &proc_sysrq_trigger_operations);
+ return 0;
+}
+module_init(sysrq_init);
+#endif
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff