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e33a9bba85
For an interface to support blocking for IOs, it must call io_schedule() instead of schedule(). This makes it tedious to add IO blocking to existing interfaces as the switching between schedule() and io_schedule() is often buried deep. As we already have a way to mark the task as IO scheduling, this can be made easier by separating out io_schedule() into multiple steps so that IO schedule preparation can be performed before invoking a blocking interface and the actual accounting happens inside the scheduler. io_schedule_timeout() does the following three things prior to calling schedule_timeout(). 1. Mark the task as scheduling for IO. 2. Flush out plugged IOs. 3. Account the IO scheduling. done close to the actual scheduling. This patch moves #3 into the scheduler so that later patches can separate out preparation and finish steps from io_schedule(). Patch-originally-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: adilger.kernel@dilger.ca Cc: akpm@linux-foundation.org Cc: axboe@kernel.dk Cc: jack@suse.com Cc: kernel-team@fb.com Cc: mingbo@fb.com Cc: tytso@mit.edu Link: http://lkml.kernel.org/r/20161207204841.GA22296@htj.duckdns.org Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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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.