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43a17111c2
We wake up klogd very late - only when current console_sem owner is done pushing pending kernel messages to the serial/net consoles. In some cases this results in lost syslog messages, because kernel log buffer is a circular buffer and if we don't wakeup syslog long enough there are chances that logbuf simply will wrap around. The patch moves the klogd wake up call to vprintk_emit(), which is the only legit way for a kernel message to appear in the logbuf, right after the attempt to handle consoles. As a result, klogd will get waken either after flushing the new message to consoles or immediately when consoles are still busy with older messages. Link: http://lkml.kernel.org/r/20180419014250.5692-1-sergey.senozhatsky@gmail.com To: Steven Rostedt <rostedt@goodmis.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Tejun Heo <tj@kernel.org> Cc: linux-kernel@vger.kernel.org Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Signed-off-by: Petr Mladek <pmladek@suse.com> |
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.