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If we only call process_csb() from the tasklet, though we lose the ability to bypass ksoftirqd interrupt processing on direct submission paths, we can push it out of the irq-off spinlock. The penalty is that we then allow schedule_out to be called concurrently with schedule_in requiring us to handle the usage count (baked into the pointer itself) atomically. As we do kick the tasklets (via local_bh_enable()) after our submission, there is a possibility there to see if we can pull the local softirq processing back from the ksoftirqd. v2: Store the 'switch_priority_hint' on submission, so that we can safely check during process_csb(). Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190816171608.11760-1-chris@chris-wilson.co.uk
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.
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.