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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 <[email protected]> Signed-off-by: Rich Ercolani <[email protected]> Closes openzfs#16530
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -50,4 +50,7 @@ | |
| #define kfpu_fini() do {} while (0) | ||
| #endif | ||
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| #define simd_stat_init() 0 | ||
| #define simd_stat_fini() 0 | ||
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| #endif | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -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> | ||
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| #ifdef _KERNEL | ||
| #ifdef __linux__ | ||
| #include <linux/simd.h> | ||
| #endif /* __linux__ */ | ||
| kstat_t *simd_stat_kstat; | ||
| #endif /* _KERNEL */ | ||
|
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| #ifdef _KERNEL | ||
| #define SIMD_STAT_PRINT(s, feat, val) \ | ||
| kmem_scnprintf(s + off, MAX(4095-off, 0), "%-16s\t%1d\n", feat, (val)) | ||
|
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| static int | ||
| simd_stat_kstat_data(char *buf, size_t size, void *data) | ||
| { | ||
| (void) data; | ||
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| 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()); | ||
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| 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; | ||
| } | ||
|
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| kmem_scnprintf(buf, MIN(off, size), "%s", simd_stat_kstat_payload); | ||
| #endif /* __linux__ */ | ||
| return (0); | ||
| } | ||
| #endif /* _KERNEL */ | ||
|
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| void | ||
| simd_stat_init(void) | ||
| { | ||
| static boolean_t simd_stat_initialized = B_FALSE; | ||
|
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| 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); | ||
|
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| 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; | ||
| } | ||
|
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| void | ||
| simd_stat_fini(void) | ||
| { | ||
| #if defined(_KERNEL) | ||
| if (simd_stat_kstat != NULL) { | ||
| kstat_delete(simd_stat_kstat); | ||
| simd_stat_kstat = NULL; | ||
| } | ||
| #endif | ||
| } | ||
|
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| #ifdef _KERNEL | ||
| EXPORT_SYMBOL(simd_stat_init); | ||
| EXPORT_SYMBOL(simd_stat_fini); | ||
| #endif |
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