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Instructions lmw/stmw are interesting for functions that are rarely used and not in the cache, because only one instruction is to be copied into the instruction cache instead of 19. However those instruction are less performant than 19x raw lwz/stw as they require synchronisation plus one additional cycle. SAVE_NVGPRS / REST_NVGPRS are used in only a few places which are mostly in interrupts entries/exits and in task switch so they are likely already in the cache. Using standard lwz improves null_syscall selftest by: - 10 cycles on mpc832x. - 2 cycles on mpc8xx. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/316c543b8906712c108985c8463eec09c8db577b.1629732542.git.christophe.leroy@csgroup.eu
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.