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From: Khalid Aziz <khalid.aziz@oracle.com>
To: Michal Hocko <mhocko@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Johannes Weiner <hannes@cmpxchg.org>
Cc: Vlastimil Babka <vbabka@suse.cz>,
	linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>,
	Michal Hocko <mhocko@suse.com>
Subject: Re: [PATCH] mm, sparse: do not swamp log with huge vmemmap allocation failures
Date: Mon, 06 Nov 2017 11:14:27 -0700	[thread overview]
Message-ID: <1509992067.4140.1.camel@oracle.com> (raw)
In-Reply-To: <20171106092228.31098-1-mhocko@kernel.org>

On Mon, 2017-11-06 at 10:22 +0100, Michal Hocko wrote:
> From: Michal Hocko <mhocko@suse.com>
> 
> While doing a memory hotplug tests under a heavy memory pressure we
> have
> noticed too many page allocation failures when allocating vmemmap
> memmap
> backed by huge page
> ......... deleted .........
> +
> +		if (!warned) {
> +			warn_alloc(gfp_mask, NULL, "vmemmap alloc
> failure: order:%u", order);
> +			warned = true;
> +		}
>  		return NULL;
>  	} else
>  		return __earlyonly_bootmem_alloc(node, size, size,

This will warn once and only once after a kernel is booted. This
condition may happen repeatedly over a long period of time with
significant time span between two such events and it can be useful to
know if this is happening repeatedly. There might be better ways to
throttle the rate of warnings, something like warn once and then
suppress warnings for the next 15 minutes (or pick any other time
frame). If this condition happens again later, there will be another
warning.

--
Khalid

WARNING: multiple messages have this Message-ID
From: Khalid Aziz <khalid.aziz@oracle.com>
To: Michal Hocko <mhocko@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Johannes Weiner <hannes@cmpxchg.org>
Cc: Vlastimil Babka <vbabka@suse.cz>,
	linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>,
	Michal Hocko <mhocko@suse.com>
Subject: Re: [PATCH] mm, sparse: do not swamp log with huge vmemmap allocation failures
Date: Mon, 06 Nov 2017 11:14:27 -0700	[thread overview]
Message-ID: <1509992067.4140.1.camel@oracle.com> (raw)
In-Reply-To: <20171106092228.31098-1-mhocko@kernel.org>

On Mon, 2017-11-06 at 10:22 +0100, Michal Hocko wrote:
> From: Michal Hocko <mhocko@suse.com>
> 
> While doing a memory hotplug tests under a heavy memory pressure we
> have
> noticed too many page allocation failures when allocating vmemmap
> memmap
> backed by huge page
> ......... deleted .........
> +
> +		if (!warned) {
> +			warn_alloc(gfp_mask, NULL, "vmemmap alloc
> failure: order:%u", order);
> +			warned = true;
> +		}
>  		return NULL;
>  	} else
>  		return __earlyonly_bootmem_alloc(node, size, size,

This will warn once and only once after a kernel is booted. This
condition may happen repeatedly over a long period of time with
significant time span between two such events and it can be useful to
know if this is happening repeatedly. There might be better ways to
throttle the rate of warnings, something like warn once and then
suppress warnings for the next 15 minutes (or pick any other time
frame). If this condition happens again later, there will be another
warning.

--
Khalid

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  parent reply	other threads:[~2017-11-06 18:15 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-06  9:22 Michal Hocko
2017-11-06  9:22 ` Michal Hocko
2017-11-06 17:35 ` Johannes Weiner
2017-11-06 17:35   ` Johannes Weiner
2017-11-06 17:57   ` Joe Perches
2017-11-06 18:14 ` Khalid Aziz [this message]
2017-11-06 18:14   ` Khalid Aziz
2017-11-06 18:18   ` Michal Hocko
2017-11-06 18:18     ` Michal Hocko
2017-11-06 20:17     ` Khalid Aziz
2017-11-06 20:17       ` Khalid Aziz
2017-11-07  9:06 ` Michal Hocko
2017-11-07  9:06   ` Michal Hocko
2017-11-06 20:56 [RFC PATCH for 4.15 00/14] Restartable sequences and CPU op vector v10 Mathieu Desnoyers
2017-11-06 20:56 ` Mathieu Desnoyers
2017-11-06 20:56 ` [RFC PATCH v10 for 4.15 01/14] Restartable sequences system call Mathieu Desnoyers
2017-11-07  1:24   ` Boqun Feng
2017-11-07  1:24     ` Boqun Feng
2017-11-07  2:20     ` Mathieu Desnoyers
2017-11-07  2:20       ` Mathieu Desnoyers
2017-11-06 20:56 ` [RFC PATCH for 4.15 02/14] Restartable sequences: ARM 32 architecture support Mathieu Desnoyers
2017-11-06 20:56 ` [RFC PATCH for 4.15 03/14] Restartable sequences: wire up ARM 32 system call Mathieu Desnoyers
2017-11-06 20:56 ` [RFC PATCH for 4.15 04/14] Restartable sequences: x86 32/64 architecture support Mathieu Desnoyers
2017-11-06 20:56 ` [RFC PATCH for 4.15 05/14] Restartable sequences: wire up x86 32/64 system call Mathieu Desnoyers
2017-11-06 20:56 ` [RFC PATCH for 4.15 06/14] Restartable sequences: powerpc architecture support Mathieu Desnoyers
2017-11-06 20:56   ` Mathieu Desnoyers
2017-11-06 20:56 ` [RFC PATCH for 4.15 07/14] Restartable sequences: Wire up powerpc system call Mathieu Desnoyers
2017-11-06 20:56   ` Mathieu Desnoyers
2017-11-06 20:56 ` [RFC PATCH v2 for 4.15 08/14] Provide cpu_opv " Mathieu Desnoyers
2017-11-07  2:07   ` Boqun Feng
2017-11-07  2:07     ` Boqun Feng
2017-11-07  2:40     ` Mathieu Desnoyers
2017-11-07  2:40       ` Mathieu Desnoyers
2017-11-07  3:03       ` Boqun Feng
2017-11-07  3:03         ` Boqun Feng
2017-11-06 20:56 ` [RFC PATCH for 4.15 09/14] cpu_opv: Wire up x86 32/64 " Mathieu Desnoyers
2017-11-06 20:56   ` Mathieu Desnoyers
2017-11-06 20:56 ` [RFC PATCH for 4.15 10/14] cpu_opv: Wire up powerpc " Mathieu Desnoyers
2017-11-06 20:56   ` Mathieu Desnoyers
2017-11-07  0:37   ` Nicholas Piggin
2017-11-07  0:37     ` Nicholas Piggin
2017-11-07  0:47     ` Mathieu Desnoyers
2017-11-07  0:47       ` Mathieu Desnoyers
2017-11-07  1:21       ` Nicholas Piggin
2017-11-07  1:21         ` Nicholas Piggin
2017-11-06 20:56 ` [RFC PATCH for 4.15 11/14] cpu_opv: Wire up ARM32 " Mathieu Desnoyers
2017-11-06 20:56 ` [RFC PATCH v2 for 4.15 12/14] cpu_opv: Implement selftests Mathieu Desnoyers
2017-11-06 20:56 ` [RFC PATCH v2 for 4.15 13/14] Restartable sequences: Provide self-tests Mathieu Desnoyers
2017-11-06 20:56   ` Mathieu Desnoyers
2017-11-06 20:56 ` [RFC PATCH for 4.15 14/14] Restartable sequences selftests: arm: workaround gcc asm size guess Mathieu Desnoyers
2017-11-06 20:56   ` Mathieu Desnoyers

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