mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-03-02 23:18:44 +00:00
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
122 lines
5.4 KiB
C
122 lines
5.4 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 2020 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/assert.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/state.internal.h"
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#include "libc/errno.h"
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#include "libc/intrin/directmap.internal.h"
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#include "libc/nt/enum/filemapflags.h"
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#include "libc/nt/enum/pageflags.h"
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#include "libc/nt/errors.h"
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#include "libc/nt/memory.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/struct/processmemorycounters.h"
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#include "libc/nt/struct/securityattributes.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/prot.h"
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textwindows struct DirectMap sys_mmap_nt(void *addr, size_t size, int prot,
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int flags, int fd, int64_t off) {
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int64_t handle;
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if (flags & MAP_ANONYMOUS) {
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handle = kNtInvalidHandleValue;
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} else {
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handle = g_fds.p[fd].handle;
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}
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// mark map handle as inheritable if fork might need it
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const struct NtSecurityAttributes *mapsec;
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if ((flags & MAP_TYPE) == MAP_SHARED) {
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mapsec = &kNtIsInheritable;
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} else {
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mapsec = 0;
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}
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// nt will whine under many circumstances if we change the execute bit
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// later using mprotect(). the workaround is to always request execute
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// and then virtualprotect() it away until we actually need it. please
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// note that open-nt.c always requests an kNtGenericExecute accessmask
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int iscow = false;
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struct ProtectNt fl;
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if (handle != -1) {
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if ((flags & MAP_TYPE) != MAP_SHARED) {
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// windows has cow pages but they can't propagate across fork()
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// that means we only get copy-on-write for the root process :(
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fl = (struct ProtectNt){kNtPageExecuteWritecopy,
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kNtFileMapCopy | kNtFileMapExecute};
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iscow = true;
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} else {
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if ((g_fds.p[fd].flags & O_ACCMODE) == O_RDONLY) {
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fl = (struct ProtectNt){kNtPageExecuteRead,
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kNtFileMapRead | kNtFileMapExecute};
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} else {
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fl = (struct ProtectNt){kNtPageExecuteReadwrite,
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kNtFileMapWrite | kNtFileMapExecute};
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}
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}
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} else {
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unassert(flags & MAP_ANONYMOUS);
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fl = (struct ProtectNt){kNtPageExecuteReadwrite,
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kNtFileMapWrite | kNtFileMapExecute};
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}
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int e = errno;
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struct DirectMap dm;
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TryAgain:
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if ((dm.maphandle = CreateFileMapping(handle, mapsec, fl.flags1,
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(size + off) >> 32, (size + off), 0))) {
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if ((dm.addr = MapViewOfFileEx(dm.maphandle, fl.flags2, off >> 32, off,
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size, addr))) {
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uint32_t oldprot;
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if (VirtualProtect(dm.addr, size, __prot2nt(prot, iscow), &oldprot))
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return dm;
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UnmapViewOfFile(dm.addr);
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}
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CloseHandle(dm.maphandle);
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} else if (!(prot & PROT_EXEC) && //
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(fl.flags2 & kNtFileMapExecute) && //
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GetLastError() == kNtErrorAccessDenied) {
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// your file needs to have been O_CREAT'd with exec `mode` bits in
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// order to be mapped with executable permission. we always try to
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// get execute permission if the kernel will give it to us because
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// win32 would otherwise forbid mprotect() from elevating later on
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fl.flags2 &= ~kNtFileMapExecute;
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switch (fl.flags1) {
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case kNtPageExecuteWritecopy:
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fl.flags1 = kNtPageWritecopy;
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break;
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case kNtPageExecuteReadwrite:
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fl.flags1 = kNtPageReadwrite;
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break;
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case kNtPageExecuteRead:
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fl.flags1 = kNtPageReadonly;
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break;
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default:
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__builtin_unreachable();
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}
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errno = e;
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goto TryAgain;
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}
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dm.maphandle = kNtInvalidHandleValue;
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dm.addr = (void *)(intptr_t)-1;
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return dm;
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}
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