linux-kernel - Re: [PATCH] crash_core: export vmemmap when CONFIG_SPARSEMEM

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Message-ID: <a7d85fee-23cd-4b85-adc6-16980b6e5e02@amperemail.onmicrosoft.com>
Date:   Tue, 28 Nov 2023 11:31:42 +0800
From:   Shijie Huang <shijie@...eremail.onmicrosoft.com>
To:     Baoquan He <bhe@...hat.com>
Cc:     Huang Shijie <shijie@...amperecomputing.com>, k-hagio-ab@....com,
        lijiang@...hat.com, akpm@...ux-foundation.org, vgoyal@...hat.com,
        dyoung@...hat.com, kexec@...ts.infradead.org,
        linux-kernel@...r.kernel.org, patches@...erecomputing.com
Subject: Re: [PATCH] crash_core: export vmemmap when CONFIG_SPARSEMEM_VMEMMAP
 is enabled


在 2023/11/28 11:25, Baoquan He 写道:
> On 11/27/23 at 11:18am, Shijie Huang wrote:
>> 在 2023/11/27 10:51, Baoquan He 写道:
>>> Hi,
>>>
>>> On 11/27/23 at 10:07am, Huang Shijie wrote:
>>>> In memory_model.h, if CONFIG_SPARSEMEM_VMEMMAP is configed,
>>>> kernel will use vmemmap to do the __pfn_to_page/page_to_pfn,
>>>> and kernel will not use the "classic sparse" to do the
>>>> __pfn_to_page/page_to_pfn.
>>>>
>>>> So export the vmemmap when CONFIG_SPARSEMEM_VMEMMAP is configed.
>>>> This makes the user applications (crash, etc) get faster
>>>> pfn_to_page/page_to_pfn operations too.
>>> Are there Crash or makedupfile patches posted yet to make use of this?
>> I have patches for Crash to use the 'vmemmap', but after this patch is
>> merged, I will send it out.
>>
>> (I think Kazu will not merge a crash patch which depends on a kernel patch
>> which is not merged.)
> Maybe post these userspace patches too so that Kazu can evaluat if those
> improvement is necessary?

No problem.  I will send out them later.


Thanks

Huang Shijie