Re: [PATCH 0/7] kallsyms: Optimizes the performance of lookup symbols

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On Thu, Sep 08, 2022 at 09:09:29PM +0800, Zhen Lei wrote:
> Currently, to search for a symbol, we need to expand the symbols in
> 'kallsyms_names' one by one, and then use the expanded string for
> comparison. This is very slow.
> 
> In fact, we can first compress the name being looked up and then use
> it for comparison when traversing 'kallsyms_names'.
> 
> This patch series optimizes the performance of function kallsyms_lookup_name(),
> and function klp_find_object_symbol() in the livepatch module. Based on the
> test results, the performance overhead is reduced to 5%. That is, the
> performance of these functions is improved by 20 times.
> 
> To avoid increasing the kernel size in non-debug mode, the optimization is only
> for the case CONFIG_KALLSYMS_ALL=y.

WIthout having time yet to reveiw the implementation details, it would
seem this is an area we may want to test for future improvements easily,
so a selftest better yet a kunit test may be nice for this. Can you
write one so we can easily gather a simple metric for "how long does
this take"?

  Luis



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