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5d01243964
mirror_zfs/module/zcommon/simd_stat.c
Rich Ercolani 5d01243964
Add SIMD metadata in /proc on Linux 
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
2024-09-20 08:16:44 -07:00

190 lines
6.2 KiB
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/*
* 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
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