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authorDaniel Verkamp <dverkamp@chromium.org>2018-11-13 00:26:52 +0100
committerShaohua Li <shli@fb.com>2018-12-20 17:53:23 +0100
commitbe85f93ae2df32dea0b20908316f1d894c3e0f64 (patch)
tree83da6e27e6ab8e949115a5a690af009c69912da3 /include
parentlib/raid6: sort algos in rough performance order (diff)
downloadlinux-be85f93ae2df32dea0b20908316f1d894c3e0f64.tar.xz
linux-be85f93ae2df32dea0b20908316f1d894c3e0f64.zip
lib/raid6: add option to skip algo benchmarking
This is helpful for systems where fast startup time is important. It is especially nice to avoid benchmarking RAID functions that are never used (for example, BTRFS selects RAID6_PQ even if the parity RAID mode is not in use). This saves 250+ milliseconds of boot time on modern x86 and ARM systems with a dozen or more available implementations. The new option is defaulted to 'y' to match the previous behavior of always benchmarking on init. Signed-off-by: Daniel Verkamp <dverkamp@chromium.org> Signed-off-by: Shaohua Li <shli@fb.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/raid/pq.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/raid/pq.h b/include/linux/raid/pq.h
index d7c99161bba2..605cf46c17bd 100644
--- a/include/linux/raid/pq.h
+++ b/include/linux/raid/pq.h
@@ -70,6 +70,9 @@ extern const char raid6_empty_zero_page[PAGE_SIZE];
#define MODULE_DESCRIPTION(desc)
#define subsys_initcall(x)
#define module_exit(x)
+
+#define IS_ENABLED(x) (x)
+#define CONFIG_RAID6_PQ_BENCHMARK 1
#endif /* __KERNEL__ */
/* Routine choices */