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In r5cache recovery, the journal device is scanned page by page. Currently, we use sync_page_io() to read journal device. This is not efficient when we have to recovery many stripes from the journal. To improve the speed of recovery, this patch introduces a read ahead page pool (ra_pool) to recovery_ctx. With ra_pool, multiple consecutive pages are read in one IO. Then the recovery code read the journal from ra_pool. With ra_pool, r5l_recovery_ctx has become much bigger. Therefore, r5l_recovery_log() is refactored so r5l_recovery_ctx is not using stack space. Signed-off-by: Song Liu <songliubraving@fb.com> Signed-off-by: Shaohua Li <shli@fb.com>
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.