[PATCH v3 0/3] Build ORC fast lookup table in scripts/sorttable tool

Huaixin Chang
2020-06-03T14:42:00Z

Move building of fast lookup table from boot to sorttable tool. This saves us
6380us boot time on Intel(R) Xeon(R) CPU E5-2682 v4 @ 2.50GHz with cores. It
adds a little more than 7ms to boot time when testing on the same CPU.

Changelog v3:
1. Modify annotation of unwind_init().

Changelog v2:
1. Type of section orc_lookup needs to be SHT_PROGBITS.
2. unwind_init() cannot be removed totally as setting lookup_num_blocks is needed.

Huaixin Chang (3):
scripts/sorttable: Change section type of orc_lookup to SHT_PROGBITS
scripts/sorttable: Build orc fast lookup table via sorttable tool
x86/unwind/orc: Simplify unwind_init() for x86 boot

arch/x86/kernel/unwind_orc.c | 41 +---------------
include/asm-generic/vmlinux.lds.h | 2 +
scripts/sorttable.h | 99 ++++++++++++++++++++++++++++++++++++---
3 files changed, 96 insertions(+), 46 deletions(-)

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2.14.4.44.g2045bb6