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From: Pavel Tatashin <pasha.tatashin@soleen.com>
To: pasha.tatashin@soleen.com, jmorris@namei.org, sashal@kernel.org,
	linux-kernel@vger.kernel.org, pmladek@suse.com,
	sergey.senozhatsky@gmail.com, rostedt@goodmis.org,
	keescook@chromium.org, anton@enomsg.org, ccross@android.com,
	tony.luck@intel.com, robh+dt@kernel.org,
	devicetree@vger.kernel.org
Subject: [PATCH v1 0/3] allow ramoops to collect all kmesg_dump events
Date: Sat,  2 May 2020 10:35:52 -0400	[thread overview]
Message-ID: <20200502143555.543636-1-pasha.tatashin@soleen.com> (raw)

Currently, ramoops is capable to collect dmesg buffer only during
panic and oops events. However, it is desirable for shutdown performance
analysis reasons to optionally allow collecting dmesg buffers during other
events as well: reboot, kexec, emergency reboot etc.

How to quickly test:

virtme-run --mods=auto --kdir --mods=auto --kdir . \
	-a memmap=1G$8G -a ramoops.mem_address=0x200000000 \
	-a ramoops.mem_size=0x100000 -a ramoops.record_size=32768 \
	-a ramoops.dump_all=1 -a quiet --qemu-opts -m 8G
..
# reboot -f

After VM is back:

# mount -t pstore pstore /mnt
# head /mnt/dmesg-ramoops-0 
Restart#1 Part1
...

Pavel Tatashin (3):
  printk: honor the max_reason field in kmsg_dumper
  pstore/ram: allow to dump kmesg during regular reboot
  ramoops: add dump_all optional field to ramoops DT node

 .../bindings/reserved-memory/ramoops.txt      |  3 ++
 fs/pstore/platform.c                          |  6 ++-
 fs/pstore/ram.c                               | 38 +++++++++++++------
 include/linux/kmsg_dump.h                     |  1 +
 include/linux/pstore.h                        |  1 +
 include/linux/pstore_ram.h                    |  1 +
 kernel/printk/printk.c                        | 16 ++++----
 7 files changed, 46 insertions(+), 20 deletions(-)

-- 
2.25.1


             reply	other threads:[~2020-05-02 14:36 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-02 14:35 Pavel Tatashin [this message]
2020-05-02 14:35 ` [PATCH v1 1/3] printk: honor the max_reason field in kmsg_dumper Pavel Tatashin
2020-05-04 17:15   ` Steven Rostedt
2020-05-04 17:56     ` Pavel Tatashin
2020-05-04 18:12     ` Kees Cook
2020-05-04 18:40       ` Pavel Tatashin
2020-05-05  1:02   ` Sergey Senozhatsky
2020-05-05  2:52     ` Pavel Tatashin
2020-05-05  3:12       ` Pavel Tatashin
2020-05-05  4:21         ` Pavel Tatashin
2020-05-05 10:50           ` Sergey Senozhatsky
2020-05-02 14:35 ` [PATCH v1 2/3] pstore/ram: allow to dump kmesg during regular reboot Pavel Tatashin
2020-05-04 19:29   ` Kees Cook
2020-05-04 20:30     ` Pavel Tatashin
2020-05-04 20:54       ` Kees Cook
2020-05-02 14:35 ` [PATCH v1 3/3] ramoops: add dump_all optional field to ramoops DT node Pavel Tatashin
2020-05-04 19:29   ` Kees Cook
2020-05-04 20:00     ` Pavel Tatashin
2020-05-05 15:14       ` Pavel Tatashin
2020-05-04 18:14 ` [PATCH v1 0/3] allow ramoops to collect all kmesg_dump events Kees Cook
2020-05-04 18:47   ` Pavel Tatashin
2020-05-04 19:12     ` Kees Cook
2020-05-04 19:17       ` Pavel Tatashin
2020-05-04 19:30         ` Kees Cook
2020-05-04 20:00           ` Pavel Tatashin
2020-05-05 12:36         ` Sergey Senozhatsky

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