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Add SIMD metadata in /proc on Linux

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Too many times, people's performance problems have amounted to
"somehow your SIMD support isn't working", and determining that
at runtime is difficult to describe to people.

This adds a /proc/spl/kstat/zfs/simd node, which exposes
metadata about which instructions ZFS thinks it can use,
on AArch64 and x86_64 Linux, to make investigating things
like this much easier.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rich Ercolani <rincebrain@gmail.com>
Closes #16530
This commit is contained in:
Rich Ercolani 2024-09-20 11:16:44 -04:00 committed by GitHub
parent 45a4a94b64
commit 5d01243964
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
7 changed files with 207 additions and 0 deletions
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3
include/os/freebsd/spl/sys/simd.h
View File

@ -50,4 +50,7 @@
#define kfpu_fini() do {} while (0)
#endif
#define simd_stat_init() 0
#define simd_stat_fini() 0
#endif

4
include/os/linux/kernel/linux/simd.h
View File

@ -45,4 +45,8 @@
#define kfpu_fini() ((void) 0)
#endif
void simd_stat_init(void);
void simd_stat_fini(void);
#endif /* _LINUX_SIMD_H */

3
lib/libspl/include/sys/simd.h
View File

@ -592,4 +592,7 @@ zfs_isa207_available(void)
#endif
extern void simd_stat_init(void);
extern void simd_stat_fini(void);
#endif /* _LIBSPL_SYS_SIMD_H */

1
lib/libzpool/Makefile.am
View File

@ -50,6 +50,7 @@ nodist_libzpool_la_SOURCES = \
module/os/linux/zfs/zio_crypt.c \
\
module/zcommon/cityhash.c \
module/zcommon/simd_stat.c \
module/zcommon/zfeature_common.c \
module/zcommon/zfs_comutil.c \
module/zcommon/zfs_deleg.c \

1
module/Kbuild.in
View File

@ -232,6 +232,7 @@ zfs-objs += $(addprefix unicode/,$(UNICODE_OBJS))
ZCOMMON_OBJS := \
cityhash.o \
simd_stat.o \
zfeature_common.o \
zfs_comutil.o \
zfs_deleg.o \

189
module/zcommon/simd_stat.c Normal file
View File

@ -0,0 +1,189 @@
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or https://opensource.org/licenses/CDDL-1.0.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2024 Google, Inc. All rights reserved.
*/
#include <sys/zfs_context.h>
#include <sys/kstat.h>
#include <sys/simd.h>
#ifdef _KERNEL
#ifdef __linux__
#include <linux/simd.h>
#endif /* __linux__ */
kstat_t *simd_stat_kstat;
#endif /* _KERNEL */
#ifdef _KERNEL
#define SIMD_STAT_PRINT(s, feat, val) \
kmem_scnprintf(s + off, MAX(4095-off, 0), "%-16s\t%1d\n", feat, (val))
static int
simd_stat_kstat_data(char *buf, size_t size, void *data)
{
(void) data;
static char simd_stat_kstat_payload[4096] = {0};
static int off = 0;
#ifdef __linux__
if (off == 0) {
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"kfpu_allowed", kfpu_allowed());
#ifdef __x86__
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"kfpu", HAVE_KERNEL_FPU);
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"kfpu_internal", HAVE_KERNEL_FPU_INTERNAL);
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"__kernel_fpu", HAVE_UNDERSCORE_KERNEL_FPU);
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"sse", zfs_sse_available());
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"sse2", zfs_sse2_available());
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"sse3", zfs_sse3_available());
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"ssse3", zfs_ssse3_available());
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"sse41", zfs_sse4_1_available());
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"sse42", zfs_sse4_2_available());
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"avx", zfs_avx_available());
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"avx2", zfs_avx2_available());
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"avx512f", zfs_avx512f_available());
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"avx512cd", zfs_avx512cd_available());
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"avx512er", zfs_avx512er_available());
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"avx512pf", zfs_avx512pf_available());
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"avx512bw", zfs_avx512bw_available());
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"avx512dq", zfs_avx512dq_available());
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"avx512vl", zfs_avx512vl_available());
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"avx512ifma", zfs_avx512ifma_available());
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"avx512vbmi", zfs_avx512vbmi_available());
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"ymm", __ymm_enabled());
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"zmm", __zmm_enabled());
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"bmi1", zfs_bmi1_available());
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"bmi2", zfs_bmi2_available());
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"aes", zfs_aes_available());
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"pclmulqdq", zfs_pclmulqdq_available());
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"movbe", zfs_movbe_available());
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"osxsave", boot_cpu_has(X86_FEATURE_OSXSAVE));
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"xsaves", static_cpu_has(X86_FEATURE_XSAVES));
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"xsaveopt", static_cpu_has(X86_FEATURE_XSAVEOPT));
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"xsave", static_cpu_has(X86_FEATURE_XSAVE));
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"fxsr", static_cpu_has(X86_FEATURE_FXSR));
#endif /* __x86__ */
#if defined(__arm__) || defined(__aarch64__)
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"kernel_neon", HAVE_KERNEL_NEON);
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"kernel_mode_neon", CONFIG_KERNEL_MODE_NEON);
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"neon", zfs_neon_available());
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"sha256", zfs_sha256_available());
#if defined(__aarch64__)
/*
* This technically can exist on 32b ARM but we don't
* define hooks to check for it and I didn't want to
* learn enough ARM ASM to add one.
*/
off += SIMD_STAT_PRINT(simd_stat_kstat_payload,
"sha512", zfs_sha512_available());
#endif /* __aarch64__ */
#endif /* __arm__ */
/* We want to short-circuit this on unsupported platforms. */
off += 1;
}
kmem_scnprintf(buf, MIN(off, size), "%s", simd_stat_kstat_payload);
#endif /* __linux__ */
return (0);
}
#endif /* _KERNEL */
void
simd_stat_init(void)
{
static boolean_t simd_stat_initialized = B_FALSE;
if (!simd_stat_initialized) {
#if defined(_KERNEL)
/* Install kstats for all implementations */
simd_stat_kstat = kstat_create("zfs", 0, "simd", "misc",
KSTAT_TYPE_RAW, 0, KSTAT_FLAG_VIRTUAL);
if (simd_stat_kstat != NULL) {
simd_stat_kstat->ks_data = (void*)(uintptr_t)1;
simd_stat_kstat->ks_ndata = 1;
simd_stat_kstat->ks_flags |= KSTAT_FLAG_NO_HEADERS;
kstat_set_raw_ops(simd_stat_kstat,
NULL,
simd_stat_kstat_data,
NULL);
kstat_install(simd_stat_kstat);
}
#endif /* _KERNEL */
}
/* Finish initialization */
simd_stat_initialized = B_TRUE;
}
void
simd_stat_fini(void)
{
#if defined(_KERNEL)
if (simd_stat_kstat != NULL) {
kstat_delete(simd_stat_kstat);
simd_stat_kstat = NULL;
}
#endif
}
#ifdef _KERNEL
EXPORT_SYMBOL(simd_stat_init);
EXPORT_SYMBOL(simd_stat_fini);
#endif

6
module/zcommon/zfs_prop.c
View File

@ -41,6 +41,7 @@
#include <sys/zfs_ioctl.h>
#include <sys/zfs_znode.h>
#include <sys/dsl_crypt.h>
#include <sys/simd.h>
#include "zfs_prop.h"
#include "zfs_deleg.h"
@ -1074,6 +1075,9 @@ EXPORT_SYMBOL(zfs_kfpu_fpregs);
extern int __init zcommon_init(void);
extern void zcommon_fini(void);
extern void simd_stat_init(void);
extern void simd_stat_fini(void);
int __init
zcommon_init(void)
{
@ -1082,6 +1086,7 @@ zcommon_init(void)
return (error);
fletcher_4_init();
simd_stat_init();
return (0);
}
@ -1089,6 +1094,7 @@ zcommon_init(void)
void
zcommon_fini(void)
{
simd_stat_fini();
fletcher_4_fini();
kfpu_fini();
}