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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167// SPDX-License-Identifier: GPL-2.0-only#include <linux/array_size.h>#include <linux/bitops.h>#include <linux/cleanup.h>#include <linux/console.h>#include <linux/log2.h>#include <linux/kernel.h>#include <linux/ftrace.h>#include <linux/nmi.h>#include <linux/sched/debug.h>#include <linux/string.h>#include <linux/sysctl.h>
#include <linux/sys_info.h>
static const char * const si_names[] = { [ilog2(SYS_INFO_TASKS)] = "tasks", [ilog2(SYS_INFO_MEM)] = "mem", [ilog2(SYS_INFO_TIMERS)] = "timers", [ilog2(SYS_INFO_LOCKS)] = "locks", [ilog2(SYS_INFO_FTRACE)] = "ftrace", [ilog2(SYS_INFO_PANIC_CONSOLE_REPLAY)] = "", [ilog2(SYS_INFO_ALL_BT)] = "all_bt", [ilog2(SYS_INFO_BLOCKED_TASKS)] = "blocked_tasks",};
/* * Default kernel sys_info mask. * If a kernel module calls sys_info() with "parameter == 0", then * this mask will be used. */static unsigned long kernel_si_mask;
/* Expecting string like "xxx_sys_info=tasks,mem,timers,locks,ftrace,..." */unsigned long sys_info_parse_param(char *str){ unsigned long si_bits = 0; char *s, *name; int i;
s = str; while ((name = strsep(&s, ",")) && *name) { i = match_string(si_names, ARRAY_SIZE(si_names), name); if (i >= 0) __set_bit(i, &si_bits); }
return si_bits;}
#ifdef CONFIG_SYSCTL
static int sys_info_write_handler(const struct ctl_table *table, void *buffer, size_t *lenp, loff_t *ppos, unsigned long *si_bits_global){ unsigned long si_bits; int ret;
ret = proc_dostring(table, 1, buffer, lenp, ppos); if (ret) return ret;
si_bits = sys_info_parse_param(table->data);
/* The access to the global value is not synchronized. */ WRITE_ONCE(*si_bits_global, si_bits);
return 0;}
static int sys_info_read_handler(const struct ctl_table *table, void *buffer, size_t *lenp, loff_t *ppos, unsigned long *si_bits_global){ unsigned long si_bits; unsigned int len = 0; char *delim = ""; unsigned int i;
/* The access to the global value is not synchronized. */ si_bits = READ_ONCE(*si_bits_global);
for_each_set_bit(i, &si_bits, ARRAY_SIZE(si_names)) { if (*si_names[i]) { len += scnprintf(table->data + len, table->maxlen - len, "%s%s", delim, si_names[i]); delim = ","; } }
return proc_dostring(table, 0, buffer, lenp, ppos);}
int sysctl_sys_info_handler(const struct ctl_table *ro_table, int write, void *buffer, size_t *lenp, loff_t *ppos){ struct ctl_table table; unsigned int i; size_t maxlen;
maxlen = 0; for (i = 0; i < ARRAY_SIZE(si_names); i++) maxlen += strlen(si_names[i]) + 1;
char *names __free(kfree) = kzalloc(maxlen, GFP_KERNEL); if (!names) return -ENOMEM;
table = *ro_table; table.data = names; table.maxlen = maxlen;
if (write) return sys_info_write_handler(&table, buffer, lenp, ppos, ro_table->data); else return sys_info_read_handler(&table, buffer, lenp, ppos, ro_table->data);}
static const struct ctl_table sys_info_sysctls[] = { { .procname = "kernel_sys_info", .data = &kernel_si_mask, .maxlen = sizeof(kernel_si_mask), .mode = 0644, .proc_handler = sysctl_sys_info_handler, },};
static int __init sys_info_sysctl_init(void){ register_sysctl_init("kernel", sys_info_sysctls); return 0;}subsys_initcall(sys_info_sysctl_init);#endif
static void __sys_info(unsigned long si_mask){ if (si_mask & SYS_INFO_TASKS) show_state();
if (si_mask & SYS_INFO_MEM) show_mem();
if (si_mask & SYS_INFO_TIMERS) sysrq_timer_list_show();
if (si_mask & SYS_INFO_LOCKS) debug_show_all_locks();
if (si_mask & SYS_INFO_FTRACE) ftrace_dump(DUMP_ALL);
if (si_mask & SYS_INFO_ALL_BT) trigger_all_cpu_backtrace();
if (si_mask & SYS_INFO_BLOCKED_TASKS) show_state_filter(TASK_UNINTERRUPTIBLE);}
void sys_info(unsigned long si_mask){ __sys_info(si_mask ? : kernel_si_mask);}