b25ec50b69
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 linux/arm64. With CLONE_VM the child process shares the same memory with the parent process. On its own this would lead to conflicting use of the same memory, so CLONE_VFORK is used to suspend the parent process until the child releases the memory when switching to the new program binary via the exec syscall. When the parent process continues to run, one has to consider the changes to memory that the child process did, namely the return address of the syscall function needs to be restored from a register. exec.Command() callers can start in a faster manner, as child process who do exec commands job can be cloned faster via vfork than via fork on arm64. The same problem was addressed on linux/amd64 via issue #5838. Updates #31936 Contributed by Howard Zhang <howard.zhang@arm.com> and Bin Lu <bin.lu@arm.com> Change-Id: Ia99d81d877f564ec60d19f17e596276836576eaf Reviewed-on: https://go-review.googlesource.com/c/go/+/189418 Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com> Reviewed-by: Cherry Zhang <cherryyz@google.com> |
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