diff options
Diffstat (limited to 'drivers/char/sysrq.c')
| -rw-r--r-- | drivers/char/sysrq.c | 44 |
1 files changed, 33 insertions, 11 deletions
diff --git a/drivers/char/sysrq.c b/drivers/char/sysrq.c index ce0d9da52a8..33a9351c896 100644 --- a/drivers/char/sysrq.c +++ b/drivers/char/sysrq.c @@ -82,7 +82,7 @@ static void sysrq_handle_loglevel(int key, struct tty_struct *tty) } 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, }; @@ -233,7 +233,7 @@ static void sysrq_handle_showallcpus(int key, struct tty_struct *tty) 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, }; @@ -247,7 +247,7 @@ static void sysrq_handle_showregs(int key, struct tty_struct *tty) } 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, }; @@ -258,7 +258,7 @@ static void sysrq_handle_showstate(int key, struct tty_struct *tty) } 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, }; @@ -269,11 +269,27 @@ static void sysrq_handle_showstate_blocked(int key, struct tty_struct *tty) } 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 = "dumpZ-ftrace-buffer", + .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) { @@ -281,7 +297,7 @@ 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, }; @@ -307,7 +323,7 @@ static void sysrq_handle_term(int key, struct tty_struct *tty) } 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, }; @@ -325,7 +341,7 @@ static void sysrq_handle_moom(int key, struct tty_struct *tty) } 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, }; @@ -337,7 +353,7 @@ 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, }; @@ -348,7 +364,7 @@ static void sysrq_handle_unrt(int key, struct tty_struct *tty) } 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, }; @@ -406,7 +422,7 @@ static struct sysrq_key_op *sysrq_key_table[36] = { 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 */ @@ -457,6 +473,12 @@ void __handle_sysrq(int key, struct tty_struct *tty, int check_mask) 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 : "); |