mirror of
https://github.com/torvalds/linux.git
synced 2024-11-28 15:11:31 +00:00
2aa14b1ab2
Updates the kernel's zstd library to v1.5.2, the latest zstd release. The upstream tag it is updated to is `v1.5.2-kernel`, which contains several cherry-picked commits on top of the v1.5.2 release which are required for the kernel update. I will create this tag once the PR is ready to merge, until then reference the temporary upstream branch `v1.5.2-kernel-cherrypicks`. I plan to submit this patch as part of the v6.2 merge window. I've done basic build testing & testing on x86-64, i386, and aarch64. I'm merging these patches into my `zstd-next` branch, which is pulled into `linux-next` for further testing. I've benchmarked BtrFS with zstd compression on a x86-64 machine, and saw these results. Decompression speed is a small win across the board. The lower compression levels 1-4 see both compression speed and compression ratio wins. The higher compression levels see a small compression speed loss and about neutral ratio. I expect the lower compression levels to be used much more heavily than the high compression levels, so this should be a net win. Level CTime DTime Ratio 1 -2.95% -1.1% -0.7% 3 -3.5% -1.2% -0.5% 5 +3.7% -1.0% +0.0% 7 +3.2% -0.9% +0.0% 9 -4.3% -0.8% +0.1% Signed-off-by: Nick Terrell <terrelln@fb.com>
94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
/*
|
|
* Copyright (c) Facebook, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This source code is licensed under both the BSD-style license (found in the
|
|
* LICENSE file in the root directory of this source tree) and the GPLv2 (found
|
|
* in the COPYING file in the root directory of this source tree).
|
|
* You may select, at your option, one of the above-listed licenses.
|
|
*/
|
|
|
|
#ifndef ZSTD_PORTABILITY_MACROS_H
|
|
#define ZSTD_PORTABILITY_MACROS_H
|
|
|
|
/*
|
|
* This header file contains macro defintions to support portability.
|
|
* This header is shared between C and ASM code, so it MUST only
|
|
* contain macro definitions. It MUST not contain any C code.
|
|
*
|
|
* This header ONLY defines macros to detect platforms/feature support.
|
|
*
|
|
*/
|
|
|
|
|
|
/* compat. with non-clang compilers */
|
|
#ifndef __has_attribute
|
|
#define __has_attribute(x) 0
|
|
#endif
|
|
|
|
/* compat. with non-clang compilers */
|
|
#ifndef __has_builtin
|
|
# define __has_builtin(x) 0
|
|
#endif
|
|
|
|
/* compat. with non-clang compilers */
|
|
#ifndef __has_feature
|
|
# define __has_feature(x) 0
|
|
#endif
|
|
|
|
/* detects whether we are being compiled under msan */
|
|
|
|
/* detects whether we are being compiled under asan */
|
|
|
|
/* detects whether we are being compiled under dfsan */
|
|
|
|
/* Mark the internal assembly functions as hidden */
|
|
#ifdef __ELF__
|
|
# define ZSTD_HIDE_ASM_FUNCTION(func) .hidden func
|
|
#else
|
|
# define ZSTD_HIDE_ASM_FUNCTION(func)
|
|
#endif
|
|
|
|
/* Enable runtime BMI2 dispatch based on the CPU.
|
|
* Enabled for clang & gcc >=4.8 on x86 when BMI2 isn't enabled by default.
|
|
*/
|
|
#ifndef DYNAMIC_BMI2
|
|
#if ((defined(__clang__) && __has_attribute(__target__)) \
|
|
|| (defined(__GNUC__) \
|
|
&& (__GNUC__ >= 5 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)))) \
|
|
&& (defined(__x86_64__) || defined(_M_X64)) \
|
|
&& !defined(__BMI2__)
|
|
# define DYNAMIC_BMI2 1
|
|
#else
|
|
# define DYNAMIC_BMI2 0
|
|
#endif
|
|
#endif
|
|
|
|
/*
|
|
* Only enable assembly for GNUC comptabile compilers,
|
|
* because other platforms may not support GAS assembly syntax.
|
|
*
|
|
* Only enable assembly for Linux / MacOS, other platforms may
|
|
* work, but they haven't been tested. This could likely be
|
|
* extended to BSD systems.
|
|
*
|
|
* Disable assembly when MSAN is enabled, because MSAN requires
|
|
* 100% of code to be instrumented to work.
|
|
*/
|
|
#define ZSTD_ASM_SUPPORTED 1
|
|
|
|
/*
|
|
* Determines whether we should enable assembly for x86-64
|
|
* with BMI2.
|
|
*
|
|
* Enable if all of the following conditions hold:
|
|
* - ASM hasn't been explicitly disabled by defining ZSTD_DISABLE_ASM
|
|
* - Assembly is supported
|
|
* - We are compiling for x86-64 and either:
|
|
* - DYNAMIC_BMI2 is enabled
|
|
* - BMI2 is supported at compile time
|
|
*/
|
|
#define ZSTD_ENABLE_ASM_X86_64_BMI2 0
|
|
|
|
#endif /* ZSTD_PORTABILITY_MACROS_H */
|