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If the function for checking whether there is OA buffer data available (during a poll or blocking read) has false positives then we want to avoid a situation where the subsequent read() returns EAGAIN (after a more accurate check) followed by a poll() immediately reporting the same false positive POLLIN event and effectively maintaining a busy loop until there really is data. This makes sure that we clear the .pollin event status whenever we return EAGAIN to userspace which will throttle subsequent POLLIN events and repeated attempts to read to the 5ms intervals of the hrtimer callback we have. Signed-off-by: Robert Bragg <robert@sixbynine.org> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170511154345.962-3-lionel.g.landwerlin@intel.com Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> |
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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.