[Crash-utility] [PATCH v3 7/7] log: add help text for printk safe buffers
Signed-off-by: Shogo Matsumoto <shogo.matsumoto(a)fujitsu.com>
---
help.c | 25 ++++++++++++++++++++++++-
1 file changed, 24 insertions(+), 1 deletion(-)
diff --git a/help.c b/help.c
index 04a7eff..d8d2eab 100644
--- a/help.c
+++ b/help.c
@@ -3886,7 +3886,7 @@ NULL
char *help_log[] = {
"log",
"dump system message buffer",
-"[-Ttdma]",
+"[-Ttdmas]",
" This command dumps the kernel log_buf contents in chronological order.
The",
" command supports the older log_buf formats, which may or may not contain
a",
" timestamp inserted prior to each message, as well as the newer
variable-length",
@@ -3907,6 +3907,8 @@ char *help_log[] = {
" shown with 'set debug 1'.",
" -a Dump the audit logs remaining in kernel audit buffers that have not",
" been copied out to the user-space audit daemon.",
+" -s Dump the printk logs remaining in kernel safe per-CPU buffers that",
+" have not been flushed out to log_buf.",
" ",
"\nEXAMPLES",
" Dump the kernel message buffer:\n",
@@ -4054,6 +4056,27 @@ char *help_log[] = {
" [Sat Apr 4 07:41:09 2020] MTRR default type: uncachable",
" [Sat Apr 4 07:41:09 2020] MTRR variable ranges disabled:",
" ...",
+" ",
+" On a system which has printk_safe_seq_buf buffer,",
+" display its unflushed log with buffer name:\n",
+" %s> log",
+" [nmi_print_seq] Uhhuh. NMI received for unknown reason 30 on CPU 0.",
+" [nmi_print_seq] Do you have a strange power saving mode enabled?",
+" [nmi_print_seq] Dazed and confused, but trying to continue",
+" ...",
+" ",
+" Dump the printk safe buffers:\n",
+" %s> log -s",
+" PRINTK_SAFE_SEQ_BUF: nmi_print_seq",
+" CPU: 0 ADDR: ffff8ca4fbc19ce0 LEN: 150 MESSAGE_LOST: 0",
+" Uhhuh. NMI received for unknown reason 20 on CPU 0.",
+" Do you have a strange power saving mode enabled?",
+" Dazed and confused, but trying to continue",
+" ...",
+" PRINTK_SAFE_SEQ_BUF: safe_print_seq",
+" CPU: 0 ADDR: ffff8ca4fbc1ad00 LEN: 0 MESSAGE_LOST: 0",
+" (empty)",
+" ...",
NULL
};
--
2.29.2