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From: Mike Rapoport <rppt@kernel.org>
To: Qian Cai <quic_qiancai@quicinc.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] arm64: Track no early_pgtable_alloc() for kmemleak
Date: Fri, 5 Nov 2021 12:49:47 +0200	[thread overview]
Message-ID: <YYUMSwqqW2MHKKuT@kernel.org> (raw)
In-Reply-To: <9bb6fe11-c10a-a373-9288-d44a5ba976fa@quicinc.com>

On Thu, Nov 04, 2021 at 01:57:03PM -0400, Qian Cai wrote:
> 
> 
> On 11/4/21 1:06 PM, Mike Rapoport wrote:
> > I think I'll be better to rename MEMBLOCK_ALLOC_KASAN to, say,
> > MEMBLOCK_ALLOC_NOKMEMLEAK and use that for both KASAN and page table cases.
> 
> Okay, that would look a bit nicer.
> 
> > But more generally, we are going to hit this again and again.
> > Couldn't we add a memblock allocation as a mean to get more memory to
> > kmemleak::mem_pool_alloc()?
> 
> For the last 5 years, this is the second time I am ware of this kind of
> issue just because of the 64KB->4KB switch on those servers, although I
> agree it could happen again in the future due to some new debugging
> features etc. I don't feel a strong need to rewrite it now though. Not
> sure if Catalin saw things differently. Anyway, Mike, do you agree that
> we could rewrite that separately in the future?

Yeah, the rework can definitely go on top. 

-- 
Sincerely yours,
Mike.

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

WARNING: multiple messages have this Message-ID (diff)
From: Mike Rapoport <rppt@kernel.org>
To: Qian Cai <quic_qiancai@quicinc.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] arm64: Track no early_pgtable_alloc() for kmemleak
Date: Fri, 5 Nov 2021 12:49:47 +0200	[thread overview]
Message-ID: <YYUMSwqqW2MHKKuT@kernel.org> (raw)
In-Reply-To: <9bb6fe11-c10a-a373-9288-d44a5ba976fa@quicinc.com>

On Thu, Nov 04, 2021 at 01:57:03PM -0400, Qian Cai wrote:
> 
> 
> On 11/4/21 1:06 PM, Mike Rapoport wrote:
> > I think I'll be better to rename MEMBLOCK_ALLOC_KASAN to, say,
> > MEMBLOCK_ALLOC_NOKMEMLEAK and use that for both KASAN and page table cases.
> 
> Okay, that would look a bit nicer.
> 
> > But more generally, we are going to hit this again and again.
> > Couldn't we add a memblock allocation as a mean to get more memory to
> > kmemleak::mem_pool_alloc()?
> 
> For the last 5 years, this is the second time I am ware of this kind of
> issue just because of the 64KB->4KB switch on those servers, although I
> agree it could happen again in the future due to some new debugging
> features etc. I don't feel a strong need to rewrite it now though. Not
> sure if Catalin saw things differently. Anyway, Mike, do you agree that
> we could rewrite that separately in the future?

Yeah, the rework can definitely go on top. 

-- 
Sincerely yours,
Mike.


  parent reply	other threads:[~2021-11-05 10:51 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-04 15:56 [PATCH] arm64: Track no early_pgtable_alloc() for kmemleak Qian Cai
2021-11-04 15:56 ` Qian Cai
2021-11-04 17:06 ` Mike Rapoport
2021-11-04 17:06   ` Mike Rapoport
2021-11-04 17:57   ` Qian Cai
2021-11-04 17:57     ` Qian Cai
2021-11-05 10:08     ` Catalin Marinas
2021-11-05 10:08       ` Catalin Marinas
2021-11-05 11:05       ` Mike Rapoport
2021-11-05 11:05         ` Mike Rapoport
2021-11-05 10:49     ` Mike Rapoport [this message]
2021-11-05 10:49       ` Mike Rapoport
2021-11-04 17:09 ` Catalin Marinas
2021-11-04 17:09   ` Catalin Marinas

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