u-boot/arch/powerpc
Rasmus Villemoes 729c1fe656 powerpc: introduce CONFIG_CACHE_FLUSH_WATCHDOG_THRESHOLD
When flush_cache() is called during boot on our ~7M kernel image, the
hundreds of thousands of WATCHDOG_RESET calls end up adding
significantly to boottime. Flushing a single cache line doesn't take
many microseconds, so doing these calls for every cache line is
complete overkill.

The generic watchdog_reset() provided by wdt-uclass.c actually
contains some rate-limiting logic that should in theory mitigate this,
but alas, that rate-limiting must be disabled on powerpc because of
its get_timer() implementation - get_timer() works just fine until
interrupts are disabled, but it just so happens that the "big"
flush_cache() call happens in the part of bootm where interrupts are
indeed disabled. [1] [2] [3]

I have checked with objdump that the generated code doesn't change
when this option is left at its default value of 0: gcc is smart
enough to see that the ">=" comparison is tautologically true, hence
all assignments to "flushed" are eliminated as dead stores.

On our board, setting the option to something like 65536 ends up
reducing total boottime by about 0.8 seconds.

[1] https://patchwork.ozlabs.org/project/uboot/patch/20200605111657.28773-1-rasmus.villemoes@prevas.dk/
[2] https://lists.denx.de/pipermail/u-boot/2021-April/446906.html
[3] https://lists.denx.de/pipermail/u-boot/2021-April/447280.html

Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
2021-04-27 08:28:07 +02:00
..
cpu ppc: Remove MPC837XEMDS board 2021-04-10 14:33:35 -04:00
dts powerpc: dts: t1042d4rdb: add FMan v3 nodes 2021-04-15 14:27:29 +05:30
include/asm lmb: move CONFIG_LMB in Kconfig 2021-04-22 14:09:45 -04:00
lib powerpc: introduce CONFIG_CACHE_FLUSH_WATCHDOG_THRESHOLD 2021-04-27 08:28:07 +02:00
config.mk Remove CROSS_COMPILE default from arch/*/config.mk 2020-07-01 10:11:03 -04:00
Kconfig powerpc: introduce CONFIG_CACHE_FLUSH_WATCHDOG_THRESHOLD 2021-04-27 08:28:07 +02:00
Makefile SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00