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Make fork() go 30% faster

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This change makes fork() go nearly as fast as sys_fork() on UNIX. As for
Windows this change shaves about 4-5ms off fork() + wait() latency. This
is accomplished by using WriteProcessMemory() from the parent process to
setup the address space of a suspended process; it is better than a pipe
This commit is contained in:
Justine Tunney 2025-01-01 04:59:38 -08:00
parent 98c5847727
commit 0b3c81dd4e
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
44 changed files with 769 additions and 649 deletions
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14
libc/intrin/printmapswin32.c
View file

@ -23,6 +23,7 @@
#include "libc/nt/enum/memflags.h"
#include "libc/nt/memory.h"
#include "libc/runtime/runtime.h"
#include "libc/stdio/sysparam.h"
#include "libc/str/str.h"
static const struct DescribeFlags kNtMemState[] = {
@ -46,20 +47,25 @@ const char *DescribeNtMemType(char buf[64], uint32_t x) {
return _DescribeFlags(buf, 64, kNtMemType, ARRAYLEN(kNtMemType), "kNtMem", x);
}
void __print_maps_win32(void) {
void __print_maps_win32(int64_t hProcess, const char *addr, size_t size) {
char *p, b[5][64];
struct NtMemoryBasicInformation mi;
kprintf("%-12s %-12s %10s %16s %16s %32s %32s\n", "Allocation", "BaseAddress",
"RegionSize", "State", "Type", "AllocationProtect", "Protect");
for (p = 0;; p = (char *)mi.BaseAddress + mi.RegionSize) {
bzero(&mi, sizeof(mi));
if (!VirtualQuery(p, &mi, sizeof(mi)))
if (!VirtualQueryEx(hProcess, p, &mi, sizeof(mi)))
break;
sizefmt(b[0], mi.RegionSize, 1024);
kprintf("%.12lx %.12lx %10s %16s %16s %32s %32s\n", mi.AllocationBase,
kprintf("%.12lx %.12lx %10s %16s %16s %32s %32s%s\n", mi.AllocationBase,
mi.BaseAddress, b[0], DescribeNtMemState(b[1], mi.State),
DescribeNtMemType(b[2], mi.Type),
_DescribeNtPageFlags(b[3], mi.AllocationProtect),
_DescribeNtPageFlags(b[4], mi.Protect));
_DescribeNtPageFlags(b[4], mi.Protect),
(mi.State != kNtMemFree &&
MAX(addr, (const char *)mi.BaseAddress) <
MIN(addr + size, (const char *)mi.BaseAddress + mi.RegionSize))
? " [OVERLAPS]"
: "");
}
}