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From: Song Liu <songliubraving@fb.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Song Liu <song@kernel.org>,
	Linux Memory Management List <linux-mm@kvack.org>,
	bpf <bpf@vger.kernel.org>, Networking <netdev@vger.kernel.org>,
	X86 ML <x86@kernel.org>, Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	"andrii@kernel.org" <andrii@kernel.org>,
	Kernel Team <Kernel-team@fb.com>,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
	"pmenzel@molgen.mpg.de" <pmenzel@molgen.mpg.de>,
	"rick.p.edgecombe@intel.com" <rick.p.edgecombe@intel.com>
Subject: Re: [PATCH bpf 0/4] introduce HAVE_ARCH_HUGE_VMALLOC_FLAG for bpf_prog_pack
Date: Thu, 31 Mar 2022 23:59:56 +0000	[thread overview]
Message-ID: <F3447905-8D42-46C0-B324-988A0E4E52E7@fb.com> (raw)
In-Reply-To: <YkU+ADIeWACbgFNA@infradead.org>

Hi Christoph, 

> On Mar 30, 2022, at 10:37 PM, Christoph Hellwig <hch@infradead.org> wrote:
> 
> On Wed, Mar 30, 2022 at 03:56:38PM -0700, Song Liu wrote:
>> We prematurely enabled HAVE_ARCH_HUGE_VMALLOC for x86_64, which could cause
>> issues [1], [2].
>> 
> 
> Please fix the underlying issues instead of papering over them and
> creating a huge maintainance burden for others.

I agree that this set is papering over the issue. And I would like 
your recommendations here. 

The biggest problem to me is that we (or at least myself) don't know 
all the issues HAVE_ARCH_HUGE_VMALLOC will trigger on x86_64. Right 
now we have a bug report from Paul, and the warning from Rick, but
I am afraid there might be some other issues. 

How about we approach it like this:

Since it is still early in the release cycle (pre rc1), we can keep 
HAVE_ARCH_HUGE_VMALLOC on for x86_64 for now and try to fix all the 
reported issues and warnings. If things don't go very well, we can
turn HAVE_ARCH_HUGE_VMALLOC off after rc4 or rc5. 

Does this make sense?

Thanks,
Song



  reply	other threads:[~2022-04-01  0:00 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20220330225642.1163897-1-song@kernel.org>
     [not found] ` <20220330225642.1163897-3-song@kernel.org>
2022-03-30 23:40   ` [PATCH bpf 2/4] vmalloc: introduce HAVE_ARCH_HUGE_VMALLOC_FLAG Edgecombe, Rick P
2022-03-31  0:26     ` Song Liu
     [not found] ` <20220330225642.1163897-2-song@kernel.org>
2022-03-30 23:47   ` [PATCH bpf 1/4] x86: disable HAVE_ARCH_HUGE_VMALLOC Thomas Gleixner
     [not found] ` <20220330225642.1163897-4-song@kernel.org>
2022-03-30 23:54   ` [PATCH bpf 3/4] x86: select HAVE_ARCH_HUGE_VMALLOC_FLAG for X86_64 Thomas Gleixner
2022-03-31  0:30     ` Song Liu
     [not found] ` <20220330225642.1163897-5-song@kernel.org>
2022-03-31  0:00   ` [PATCH bpf 4/4] bpf: use __vmalloc_node_range() with VM_TRY_HUGE_VMAP for bpf_prog_pack Thomas Gleixner
2022-03-31  0:31     ` Song Liu
2022-03-31  0:04 ` [PATCH bpf 0/4] introduce HAVE_ARCH_HUGE_VMALLOC_FLAG " Edgecombe, Rick P
2022-03-31  0:46   ` Song Liu
2022-03-31 16:19     ` Edgecombe, Rick P
2022-03-31  5:37 ` Christoph Hellwig
2022-03-31 23:59   ` Song Liu [this message]
2022-04-01 22:22     ` Song Liu
2022-04-05  7:07       ` Christoph Hellwig
2022-04-05 23:54         ` Song Liu
2022-04-07 19:57           ` Song Liu
2022-04-08 10:08             ` Claudio Imbrenda
2022-04-08 21:22               ` Song Liu

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