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Re: [Libunwind-devel] the behavior of unw_set_caching_policy

From: Masatake YAMATO
Subject: Re: [Libunwind-devel] the behavior of unw_set_caching_policy
Date: Wed, 18 Dec 2013 18:22:44 +0900 (JST)

Thank you very much.

Masatake YAMATO

> 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.
>  -Arun

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