forked from OSchip/llvm-project
df7c69952b
Summary: Memory reads using the ptrace API need to be executed on a designated thread and in 4-byte increments. The process_vm_read syscall has no such requirements and it is about 50 times faster. This patch makes lldb-server use the faster API if the target kernel supports it. Kernel support for this feature is determined at runtime. Using process_vm_writev in the same manner is more complicated since this syscall (unlike ptrace) respects page protection settings and so it cannot be used to set a breakpoint, since code pages are typically read-only. However, memory writes are not currently a performance bottleneck as they happen much more rarely. Test Plan: all tests continue to pass Reviewers: ovyalov, vharron Subscribers: tberghammer, lldb-commits Differential Revision: http://reviews.llvm.org/D10488 llvm-svn: 239924 |
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