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7c07012eb1
note_interrupt() increments desc->irq_count for each interrupt even for
percpu interrupt handlers, even when they are handled successfully. This
causes cacheline bouncing and limits scalability.
Instead of incrementing irq_count every time, only start incrementing it
after seeing an unhandled irq, which should avoid the cache line
bouncing in the common path.
This actually should give better consistency in handling misbehaving
irqs too, because instead of the first unhandled irq arriving at an
arbitrary point in the irq_count cycle, its arrival will begin the
irq_count cycle.
Cédric reports the result of his IPI throughput test:
Millions of IPIs/s
----------- --------------------------------------
upstream upstream patched
chips cpus default noirqdebug default (irqdebug)
----------- -----------------------------------------
1 0-15 4.061 4.153 4.084
0-31 7.937 8.186 8.158
0-47 11.018 11.392 11.233
0-63 11.460 13.907 14.022
2 0-79 8.376 18.105 18.084
0-95 7.338 22.101 22.266
0-111 6.716 25.306 25.473
0-127 6.223 27.814 28.029
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20210402132037.574661-1-npiggin@gmail.com
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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.