diff options
| author | Joel Sing <joel@sing.id.au> | 2019-05-07 17:56:49 +1000 |
|---|---|---|
| committer | Joel Sing <joel@sing.id.au> | 2021-03-03 05:33:21 +0000 |
| commit | 00cb841b83ad157bc21d36daf0626bbcd4af0d57 (patch) | |
| tree | 10d3c992346b69236eb1356bfd381cc5e4f49584 /src/syscall/asm_linux_386.s | |
| parent | f2df1e3c34ceb2225d0df5c9ec92d5dc9e9ba919 (diff) | |
| download | go-00cb841b83ad157bc21d36daf0626bbcd4af0d57.tar.xz | |
syscall: implement rawVforkSyscall for remaining linux platforms
This allows the use of CLONE_VFORK and CLONE_VM for fork/exec, preventing
'fork/exec ...: cannot allocate memory' failures from occuring when attempting
to execute commands from a Go process that has a large memory footprint.
Additionally, this should reduce the latency of fork/exec on these platforms.
Fixes #31936
Change-Id: I4e28cf0763173145cacaa5340680dca9ff449305
Reviewed-on: https://go-review.googlesource.com/c/go/+/295849
Trust: Joel Sing <joel@sing.id.au>
Run-TryBot: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Diffstat (limited to 'src/syscall/asm_linux_386.s')
| -rw-r--r-- | src/syscall/asm_linux_386.s | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/syscall/asm_linux_386.s b/src/syscall/asm_linux_386.s index 4201f367ba..1c69083118 100644 --- a/src/syscall/asm_linux_386.s +++ b/src/syscall/asm_linux_386.s @@ -110,6 +110,26 @@ ok2: MOVL $0, err+36(FP) RET +// func rawVforkSyscall(trap, a1 uintptr) (r1, err uintptr) +TEXT ·rawVforkSyscall(SB),NOSPLIT|NOFRAME,$0-16 + MOVL trap+0(FP), AX // syscall entry + MOVL a1+4(FP), BX + MOVL $0, CX + MOVL $0, DX + POPL SI // preserve return address + INVOKE_SYSCALL + PUSHL SI + CMPL AX, $0xfffff001 + JLS ok + MOVL $-1, r1+8(FP) + NEGL AX + MOVL AX, err+12(FP) + RET +ok: + MOVL AX, r1+8(FP) + MOVL $0, err+12(FP) + RET + // func rawSyscallNoError(trap uintptr, a1, a2, a3 uintptr) (r1, r2 uintptr); TEXT ·rawSyscallNoError(SB),NOSPLIT,$0-24 MOVL trap+0(FP), AX // syscall entry |