feat: use same allocator for all

[yangby-cryptape]

Notice

This PR can be reviewed but it requires test before merge.

Issue

Currently, ckb has two allocators:

• When we compile the latest version CKB on Linux, the code written by Rust will use Jemalloc.

ckb/Cargo.toml

Lines 72 to 73 in dad394e

	[target.'cfg(all(not(target_env = "msvc"), not(target_os="macos")))'.dependencies]
	jemallocator = { version = "0.3.0" }

ckb/src/main.rs

Lines 4 to 6 in dad394e

	#[cfg(all(not(target_env = "msvc"), not(target_os = "macos")))]
	#[global_allocator]
	static ALLOC: jemallocator::Jemalloc = jemallocator::Jemalloc;

• But the code written by C will use system allocator, since the jemalloc will compiled with --with-jemalloc-prefix=_rjem_,

  • unprefixed_malloc_on_supported_platforms: when disabled, configure
    jemalloc with --with-jemalloc-prefix=_rjem_. Enabling this causes symbols
    like malloc to be emitted without a prefix, overriding the ones defined by
    libc. This usually causes C and C++ code linked in the same program to use
    jemalloc as well. On some platforms prefixes are always used because
    unprefixing is known to cause segfaults due to allocator mismatches.

Solution

We can enable feature unprefixed_malloc_on_supported_platforms to let symbols like malloc to be emitted without a prefix, overriding the ones defined by libc.

[yangby-cryptape]

Hold for tests or benchmark.

[zhangsoledad]

nervosnetwork/ckb-bench-archived#10

[zhangsoledad]

bors r+

[bors]

Build succeeded

• continuous-integration/travis-ci/push