From: Luis Chamberlain Date: Tue, 9 Jun 2020 04:35:07 +0000 (-0700) Subject: include/linux/cache.h: expand documentation over __read_mostly X-Git-Tag: baikal/aarch64/sdk6.1~9130^2 X-Git-Url: https://git.baikalelectronics.ru/sdk/?a=commitdiff_plain;h=fad5fc5427ddac12db495e9e4b0de25ea950abef;p=kernel.git include/linux/cache.h: expand documentation over __read_mostly __read_mostly can easily be misused by folks, its not meant for just read-only data. There are performance reasons for using it, but we also don't provide any guidance about its use. Provide a bit more guidance over its use. Signed-off-by: Luis Chamberlain Signed-off-by: Andrew Morton Reviewed-by: Kees Cook Acked-by: Christoph Lameter Acked-by: Rafael Aquini Cc: Arnd Bergmann Cc: Matthew Wilcox Link: http://lkml.kernel.org/r/20200507161424.2584-1-mcgrof@kernel.org Signed-off-by: Linus Torvalds --- diff --git a/include/linux/cache.h b/include/linux/cache.h index 750621e41d1c1..1aa8009f6d06d 100644 --- a/include/linux/cache.h +++ b/include/linux/cache.h @@ -15,8 +15,14 @@ /* * __read_mostly is used to keep rarely changing variables out of frequently - * updated cachelines. If an architecture doesn't support it, ignore the - * hint. + * updated cachelines. Its use should be reserved for data that is used + * frequently in hot paths. Performance traces can help decide when to use + * this. You want __read_mostly data to be tightly packed, so that in the + * best case multiple frequently read variables for a hot path will be next + * to each other in order to reduce the number of cachelines needed to + * execute a critical path. We should be mindful and selective of its use. + * ie: if you're going to use it please supply a *good* justification in your + * commit log */ #ifndef __read_mostly #define __read_mostly