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5c25c4fc74
In GC thread, we record the latest GC key in gc_done, which is expected to be used for incremental GC, but in currently code, we didn't realize it. When GC runs, front side IO would be blocked until the GC over, it would be a long time if there is a lot of btree nodes. This patch realizes incremental GC, the main ideal is that, when there are front side I/Os, after GC some nodes (100), we stop GC, release locker of the btree node, and go to process the front side I/Os for some times (100 ms), then go back to GC again. By this patch, when we doing GC, I/Os are not blocked all the time, and there is no obvious I/Os zero jump problem any more. Patch v2: Rename some variables and macros name as Coly suggested. Signed-off-by: Tang Junhui <tang.junhui@zte.com.cn> Signed-off-by: Coly Li <colyli@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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.