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7730aec6b7
Start scaling arrays dynamically instead of using MAXCPU, resulting in extra allocations on startup but reducing the overall memory footprint. For the static single CPU mask we provide two versions to further save memory depending on a low or high CPU count system. The threshold to switch is currently at 128 CPUs on 64bit platforms. More detailed comments on the implementations can be found in the code. If I am not wrong on a MAXCPU=65536 system the memory footprint should roughly go down from 512M to 1.5M for the static single CPU mask. Submitted by: olce (most of this final version) Sponsored by: The FreeBSD Foundation PR: 274316 Differential Revision: https://reviews.freebsd.org/D42345 (cherry picked from commit 488e8a7faca51a71987fbf00cd36cfcd19269db7)
63 lines
2.1 KiB
C
63 lines
2.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2021 Vladimir Kondratyev <wulf@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _LINUXKPI_ASM_PROCESSOR_H_
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#define _LINUXKPI_ASM_PROCESSOR_H_
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#include <sys/types.h>
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#include <machine/cpufunc.h>
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#include <machine/cpu.h>
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#if defined(__i386__) || defined(__amd64__)
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#define X86_VENDOR_INTEL 0
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#define X86_VENDOR_CYRIX 1
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#define X86_VENDOR_AMD 2
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#define X86_VENDOR_UMC 3
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#define X86_VENDOR_CENTAUR 5
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#define X86_VENDOR_TRANSMETA 7
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#define X86_VENDOR_NSC 8
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#define X86_VENDOR_HYGON 9
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#define X86_VENDOR_NUM 12
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#define X86_VENDOR_UNKNOWN 0xff
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struct cpuinfo_x86 {
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uint8_t x86;
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uint8_t x86_model;
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uint16_t x86_clflush_size;
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uint16_t x86_max_cores;
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uint8_t x86_vendor;
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};
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extern struct cpuinfo_x86 boot_cpu_data;
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extern struct cpuinfo_x86 *__cpu_data;
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#define cpu_data(cpu) __cpu_data[cpu]
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#endif
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#define cpu_relax() cpu_spinwait()
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#endif /* _LINUXKPI_ASM_PROCESSOR_H_ */
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