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sys_info: add a default kernel sys_info mask

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Which serves as a global default sys_info mask.  When users want the same
system information for many error cases (panic, hung, lockup ...), they
can chose to set this global knob only once, while not setting up each
individual sys_info knobs.

This just adds a 'lazy' option, and doesn't change existing kernel
behavior as the mask is 0 by default.

Link: https://lkml.kernel.org/r/20251113111039.22701-5-feng.tang@linux.alibaba.com
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Feng Tang <feng.tang@linux.alibaba.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Lance Yang <ioworker0@gmail.com>
Cc: "Paul E . McKenney" <paulmck@kernel.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Feng Tang
2025-11-13 19:10:39 +08:00
committed by Andrew Morton
parent a9af76a787
commit 03ef32d665
2 changed files with 39 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
Documentation/admin-guide/sysctl/kernel.rst
View File

@@ -521,6 +521,15 @@ default), only processes with the CAP_SYS_ADMIN capability may create
io_uring instances.
kernel_sys_info
===============
A comma separated list of extra system information to be dumped when
soft/hard lockup is detected, for example, "tasks,mem,timers,locks,...".
Refer 'panic_sys_info' section below for more details.
It serves as the default kernel control knob, which will take effect
when a kernel module calls sys_info() with parameter==0.
kexec_load_disabled
===================

31
lib/sys_info.c
View File

@@ -24,6 +24,13 @@ static const char * const si_names[] = {
[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)
{
@@ -110,9 +117,26 @@ int sysctl_sys_info_handler(const struct ctl_table *ro_table, int write,
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
void sys_info(unsigned long si_mask)
static void __sys_info(unsigned long si_mask)
{
if (si_mask & SYS_INFO_TASKS)
show_state();
@@ -135,3 +159,8 @@ void sys_info(unsigned long si_mask)
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);
}