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Re: [Libunwind-devel] the behavior of unw_set_caching_policy

From: Arun Sharma
Subject: Re: [Libunwind-devel] the behavior of unw_set_caching_policy
Date: Wed, 18 Dec 2013 14:44:18 +0530

On Wed, Dec 18, 2013 at 8:34 AM, Masatake YAMATO <address@hidden> wrote:
> Thank you for replying.
> You wrote "if you're unwinding from the same IP address repeatedly."
> About strace my understanding is that invalidation is required when
> the target process calls system call which modifies the address space
> like mmap and execve because even IP address is the same IP can point
> different library or executable. Is this correct?

That's right. You don't have to worry about data getting
mapped/unmapped. But dynamically generated code or code that gets
remapped at runtime needs cache invalidation.
There is a man page for libunwind-dynamic, with an API to be used by
JITs. But it was never tested on x86 to my knowledge.


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