From: Song Liu <songliubraving@fb.com>
To: Thorsten Leemhuis <regressions@leemhuis.info>
Cc: Song Liu <song@kernel.org>,
"bpf@vger.kernel.org" <bpf@vger.kernel.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"ast@kernel.org" <ast@kernel.org>,
"daniel@iogearbox.net" <daniel@iogearbox.net>,
"andrii@kernel.org" <andrii@kernel.org>,
Kernel Team <Kernel-team@fb.com>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
"rick.p.edgecombe@intel.com" <rick.p.edgecombe@intel.com>,
"hch@infradead.org" <hch@infradead.org>,
"imbrenda@linux.ibm.com" <imbrenda@linux.ibm.com>
Subject: Re: [PATCH bpf 0/2] vmalloc: bpf: introduce VM_ALLOW_HUGE_VMAP
Date: Sun, 10 Apr 2022 01:36:09 +0000 [thread overview]
Message-ID: <FAECBBAA-CF1B-42EB-9077-C655E8FD65E8@fb.com> (raw)
In-Reply-To: <8665439b-e82e-65b8-ddb6-da6a41d6f6da@leemhuis.info>
> On Apr 9, 2022, at 4:43 AM, Thorsten Leemhuis <regressions@leemhuis.info> wrote:
>
> Hi, this is your Linux kernel regression tracker.
>
> On 09.04.22 00:34, Song Liu wrote:
>> Enabling HAVE_ARCH_HUGE_VMALLOC on x86_64 and use it for bpf_prog_pack has
>> caused some issues [1], as many users of vmalloc are not yet ready to
>> handle huge pages. To enable a more smooth transition to use huge page
>> backed vmalloc memory, this set replaces VM_NO_HUGE_VMAP flag with an new
>> opt-in flag, VM_ALLOW_HUGE_VMAP. More discussions about this topic can be
>> found at [2].
>>
>> Patch 1 removes VM_NO_HUGE_VMAP and adds VM_ALLOW_HUGE_VMAP.
>> Patch 2 uses VM_ALLOW_HUGE_VMAP in bpf_prog_pack.
>>
>> [1] https://lore.kernel.org/lkml/20220204185742.271030-1-song@kernel.org/
>> [2] https://lore.kernel.org/linux-mm/20220330225642.1163897-1-song@kernel.org/
>
> These patches apparently fix a regression (one that's mentioned in your
> [2]) that I tracked. Hence in the next iteration of your patches could
> you please instead add a 'Link:' tag pointing to the report for anyone
> wanting to look into the backstory in the future, as explained in
> 'Documentation/process/submitting-patches.rst' and
> 'Documentation/process/5.Posting.rst'? E.g. like this:
>
> "Link:
> https://lore.kernel.org/netdev/14444103-d51b-0fb3-ee63-c3f182f0b546@molgen.mpg.de/"
>
> Not totally sure, but I guess it needs a Fixes tag as well specifying
> the change that cause this regression (that's "fac54e2bfb5b"). The
> documents mentioned above explain this, too. A "Reported-by" might be
> appropriate as well.
>
> In anyone wonders why I care: there are internal and publicly used tools
> and scripts out there that reply on proper "Link" tags. I don't known
> how many, but there is at least one public tool I'm running that cares:
> regzbot, my regression tracking bot, which I use to track Linux kernel
> regressions and generate the regression reports sent to Linus. Proper
> "Link:" tags allow the bot to automatically connect regression reports
> with fixes being posted or applied to resolve the particular regression
> -- which makes regression tracking a whole lot easier and feasible for
> the Linux kernel. That's why it's a great help for me if people set
> proper "Link" tags.
>
> While at it, let me tell regzbot about this thread:
> #regzbot ^backmonitor:
> https://lore.kernel.org/netdev/14444103-d51b-0fb3-ee63-c3f182f0b546@molgen.mpg.de/
>
> Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
>
> P.S.: As the Linux kernel's regression tracker I'm getting a lot of
> reports on my table. I can only look briefly into most of them and lack
> knowledge about most of the areas they concern. I thus unfortunately
> will sometimes get things wrong or miss something important. I hope
> that's not the case here; if you think it is, don't hesitate to tell me
> in a public reply, it's in everyone's interest to set the public record
> straight.
Thanks for the reminder. I will add the Fixes tag, and try to work with
regzbot.
Song
prev parent reply other threads:[~2022-04-10 1:36 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20220408223443.3303509-1-song@kernel.org>
[not found] ` <20220408223443.3303509-2-song@kernel.org>
2022-04-09 5:28 ` [PATCH bpf 1/2] vmalloc: replace VM_NO_HUGE_VMAP with VM_ALLOW_HUGE_VMAP Christoph Hellwig
2022-04-10 1:25 ` Song Liu
[not found] ` <20220408223443.3303509-3-song@kernel.org>
2022-04-09 5:29 ` [PATCH bpf 2/2] bpf: use vmalloc with VM_ALLOW_HUGE_VMAP for bpf_prog_pack Christoph Hellwig
2022-04-10 1:34 ` Song Liu
2022-04-11 6:56 ` Christoph Hellwig
2022-04-11 22:18 ` Song Liu
2022-04-09 11:43 ` [PATCH bpf 0/2] vmalloc: bpf: introduce VM_ALLOW_HUGE_VMAP Thorsten Leemhuis
2022-04-10 1:36 ` Song Liu [this message]
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