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Sometimes, Journal takes up a lot of CPU, we need statistics to know what's the journal is doing. So this patch provide some journal statistics: 1) reclaim: how many times the journal try to reclaim resource, usually the journal bucket or/and the pin are exhausted. 2) flush_write: how many times the journal try to flush btree node to cache device, usually the journal bucket are exhausted. 3) retry_flush_write: how many times the journal retry to flush the next btree node, usually the previous tree node have been flushed by other thread. we show these statistic by sysfs interface. Through these statistics We can totally see the status of journal module when the CPU is too high. Signed-off-by: Tang Junhui <tang.junhui@zte.com.cn> Reviewed-by: Michael Lyle <mlyle@lyle.org> Signed-off-by: Jens Axboe <axboe@kernel.dk> |
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| firmware | ||
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| kernel | ||
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| README | ||
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.