mirror of
https://github.com/jart/cosmopolitan.git
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8c645fa1ee
It's now possible to create thousands of thousands of sparse independent memory mappings, without any slowdown. The memory manager is better with tracking memory protection now, particularly on Windows in a precise way that can be restored during fork(). You now have the highest quality mem manager possible. It's even better than some OSes like XNU, where mmap() is implemented as an O(n) operation which means sadly things aren't much improved over there. With this change the llamafile HTTP server endpoint at /tokenize with a prompt of 50 tokens is now able to handle 2.6m r/sec
70 lines
3.3 KiB
C
70 lines
3.3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/runtime/memtrack.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/stack.h"
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#include "libc/sysv/consts/auxv.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/prot.h"
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#define MAP_ANON_OPENBSD 0x1000
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#define MAP_STACK_OPENBSD 0x4000
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/**
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* Allocates stack.
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*
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* The size of your returned stack is always GetStackSize().
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*
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* The bottom 4096 bytes of your stack can't be used, since it's always
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* reserved for a read-only guard page. With ASAN it'll be poisoned too.
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*
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* The top 16 bytes of a stack can't be used due to openbsd:stackbound
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* and those bytes are also poisoned under ASAN build modes.
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*
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* @return stack bottom address on success, or null w/ errno
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*/
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void *NewCosmoStack(void) {
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char *p;
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size_t n = GetStackSize();
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if ((p = mmap(0, n, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1,
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0)) != MAP_FAILED) {
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if (IsOpenbsd() && __sys_mmap(p, n, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_FIXED | MAP_ANON_OPENBSD |
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MAP_STACK_OPENBSD,
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-1, 0, 0) != p)
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notpossible;
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if (mprotect(p, GetGuardSize(), PROT_NONE | PROT_GUARD))
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notpossible;
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return p;
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} else {
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return 0;
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}
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}
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/**
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* Frees stack.
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*
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* @param stk was allocated by NewCosmoStack()
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*/
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int FreeCosmoStack(void *stk) {
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return munmap(stk, GetStackSize());
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}
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