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Make realloc() go 100x faster on Linux/NetBSD

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Cosmopolitan now supports mremap(), which is only supported on Linux and
NetBSD. First, it allows memory mappings to be relocated without copying
them; this can dramatically speed up data structures like std::vector if
the array size grows larger than 256kb. The mremap() system call is also
10x faster than munmap() when shrinking large memory mappings.

There's now two functions, getpagesize() and getgransize() which help to
write portable code that uses mmap(MAP_FIXED). Alternative sysconf() may
be called with our new _SC_GRANSIZE. The madvise() system call now has a
better wrapper with improved documentation.
This commit is contained in:
Justine Tunney 2024-07-07 12:24:25 -07:00
parent 196942084b
commit f7780de24b
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GPG key ID: BE714B4575D6E328
71 changed files with 1301 additions and 640 deletions
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2
libc/sysv/syscalls.sh
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@ -59,7 +59,7 @@ scall __sys_pipe 0x02a10721e202a016 0x03b globl hidden # NOTE: pipe2() on FreeB
scall sys_select 0x9a184785d285d817 0xfff globl hidden
scall sys_pselect 0x9b486ea0a298a90e 0x848 globl hidden # pselect6() on gnu/systemd
scall sys_sched_yield 0x15e12a14bf25d018 0x07c globl hidden # select() on XNU (previously swtch() but removed in 12.4)
scall __sys_mremap 0x19bffffffffff019 0x0d8 globl hidden
scall sys_mremap 0x19bffffffffff019 0x0d8 globl hidden
scall sys_mincore 0x04e04e04e204e01b 0x0e8 globl hidden
scall sys_madvise 0x04b04b04b204b01c 0x0e9 globl hidden
scall sys_shmget 0x0e71210e7210901d 0x0c2 globl # no wrapper