erofs-linux/include/linux/raid/xor.h at f94de432646ebec7857ba2624fe082e779b52572 - erofs-linux - Gitea: Git with a cup of tea

imrcpan/erofs-linux

0 Fork 0

mirror of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git synced 2026-10-29 21:33:00 +01:00

Files

T

Christoph Hellwig 80dcf0a783 xor: pass the entire operation to the low-level ops

Currently the high-level xor code chunks up all operations into small
units for only up to 1 + 4 vectors, and passes it to four different
methods.  This means the FPU/vector context is entered and left a lot for
wide stripes, and a lot of indirect expensive indirect calls are
performed.  Switch to passing the entire gen_xor request to the low-level
ops, and provide a macro to dispatch it to the existing helper.

This reduce the number of indirect calls and FPU/vector context switches
by a factor approaching nr_stripes / 4, and also reduces source and binary
code size.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Eric Biggers <[email protected]>
Tested-by: Eric Biggers <[email protected]>
Cc: Albert Ou <[email protected]>
Cc: Alexander Gordeev <[email protected]>
Cc: Alexandre Ghiti <[email protected]>
Cc: Andreas Larsson <[email protected]>
Cc: Anton Ivanov <[email protected]>
Cc: Ard Biesheuvel <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: "Borislav Petkov (AMD)" <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Chris Mason <[email protected]>
Cc: Christian Borntraeger <[email protected]>
Cc: Dan Williams <[email protected]>
Cc: David S. Miller <[email protected]>
Cc: David Sterba <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Herbert Xu <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Huacai Chen <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jason A. Donenfeld <[email protected]>
Cc: Johannes Berg <[email protected]>
Cc: Li Nan <[email protected]>
Cc: Madhavan Srinivasan <[email protected]>
Cc: Magnus Lindholm <[email protected]>
Cc: Matt Turner <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Nicholas Piggin <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: Richard Henderson <[email protected]>
Cc: Richard Weinberger <[email protected]>
Cc: Russell King <[email protected]>
Cc: Song Liu <[email protected]>
Cc: Sven Schnelle <[email protected]>
Cc: Ted Ts'o <[email protected]>
Cc: Vasily Gorbik <[email protected]>
Cc: WANG Xuerui <[email protected]>
Cc: Will Deacon <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

2026-04-02 23:36:21 -07:00

8 lines

172 B

C

Raw Blame History

 /* SPDX-License-Identifier: GPL-2.0 */
 #ifndef _XOR_H
 #define _XOR_H
 void xor_gen(void *dest, void **srcs, unsigned int src_cnt, unsigned int bytes);
 #endif /* _XOR_H */