From: Pasha Tatashin <pasha.tatashin@oracle.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org,
linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org,
linux-s390@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
x86@kernel.org, kasan-dev@googlegroups.com,
borntraeger@de.ibm.com, heiko.carstens@de.ibm.com,
davem@davemloft.net, willy@infradead.org,
ard.biesheuvel@linaro.org, will.deacon@arm.com,
catalin.marinas@arm.com, sam@ravnborg.org
Subject: Re: [v6 15/15] mm: debug for raw alloctor
Date: Mon, 14 Aug 2017 10:01:52 -0400 [thread overview]
Message-ID: <b4eb28ad-2d58-fb23-2139-427df46c2773@oracle.com> (raw)
In-Reply-To: <20170814115000.GJ19063@dhcp22.suse.cz>
>> However, now thinking about it, I will change it to CONFIG_MEMBLOCK_DEBUG,
>> and let users decide what other debugging configs need to be enabled, as
>> this is also OK.
>
> Actually the more I think about it the more I am convinced that a kernel
> boot parameter would be better because it doesn't need the kernel to be
> recompiled and it is a single branch in not so hot path.
The main reason I do not like kernel parameter is that automated test
suits for every platform would need to be updated to include this new
parameter in order to test it.
Yet, I think it is important at least initially to test it on every
platform unconditionally when certain debug configs are enabled.
This patch series allows boot allocator to return uninitialized memory,
this behavior Linux never had before, but way too often firmware
explicitly zero all the memory before starting OS. Therefore, it would
be hard to debug issues that might be only seen during kinit type of
reboots.
In the future, when memory sizes will increase so that this memset will
become unacceptable even on debug kernels, it can always be removed, but
at least at that time we will know that the code has been tested for
many years.
WARNING: multiple messages have this Message-ID (diff)
From: Pasha Tatashin <pasha.tatashin@oracle.com>
To: linux-arm-kernel@lists.infradead.org
Subject: Re: [v6 15/15] mm: debug for raw alloctor
Date: Mon, 14 Aug 2017 14:01:52 +0000 [thread overview]
Message-ID: <b4eb28ad-2d58-fb23-2139-427df46c2773@oracle.com> (raw)
In-Reply-To: <20170814115000.GJ19063@dhcp22.suse.cz>
>> However, now thinking about it, I will change it to CONFIG_MEMBLOCK_DEBUG,
>> and let users decide what other debugging configs need to be enabled, as
>> this is also OK.
>
> Actually the more I think about it the more I am convinced that a kernel
> boot parameter would be better because it doesn't need the kernel to be
> recompiled and it is a single branch in not so hot path.
The main reason I do not like kernel parameter is that automated test
suits for every platform would need to be updated to include this new
parameter in order to test it.
Yet, I think it is important at least initially to test it on every
platform unconditionally when certain debug configs are enabled.
This patch series allows boot allocator to return uninitialized memory,
this behavior Linux never had before, but way too often firmware
explicitly zero all the memory before starting OS. Therefore, it would
be hard to debug issues that might be only seen during kinit type of
reboots.
In the future, when memory sizes will increase so that this memset will
become unacceptable even on debug kernels, it can always be removed, but
at least at that time we will know that the code has been tested for
many years.
WARNING: multiple messages have this Message-ID (diff)
From: Pasha Tatashin <pasha.tatashin@oracle.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org,
linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org,
linux-s390@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
x86@kernel.org, kasan-dev@googlegroups.com,
borntraeger@de.ibm.com, heiko.carstens@de.ibm.com,
davem@davemloft.net, willy@infradead.org,
ard.biesheuvel@linaro.org, will.deacon@arm.com,
catalin.marinas@arm.com, sam@ravnborg.org
Subject: Re: [v6 15/15] mm: debug for raw alloctor
Date: Mon, 14 Aug 2017 10:01:52 -0400 [thread overview]
Message-ID: <b4eb28ad-2d58-fb23-2139-427df46c2773@oracle.com> (raw)
In-Reply-To: <20170814115000.GJ19063@dhcp22.suse.cz>
>> However, now thinking about it, I will change it to CONFIG_MEMBLOCK_DEBUG,
>> and let users decide what other debugging configs need to be enabled, as
>> this is also OK.
>
> Actually the more I think about it the more I am convinced that a kernel
> boot parameter would be better because it doesn't need the kernel to be
> recompiled and it is a single branch in not so hot path.
The main reason I do not like kernel parameter is that automated test
suits for every platform would need to be updated to include this new
parameter in order to test it.
Yet, I think it is important at least initially to test it on every
platform unconditionally when certain debug configs are enabled.
This patch series allows boot allocator to return uninitialized memory,
this behavior Linux never had before, but way too often firmware
explicitly zero all the memory before starting OS. Therefore, it would
be hard to debug issues that might be only seen during kinit type of
reboots.
In the future, when memory sizes will increase so that this memset will
become unacceptable even on debug kernels, it can always be removed, but
at least at that time we will know that the code has been tested for
many years.
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
WARNING: multiple messages have this Message-ID (diff)
From: pasha.tatashin@oracle.com (Pasha Tatashin)
To: linux-arm-kernel@lists.infradead.org
Subject: [v6 15/15] mm: debug for raw alloctor
Date: Mon, 14 Aug 2017 10:01:52 -0400 [thread overview]
Message-ID: <b4eb28ad-2d58-fb23-2139-427df46c2773@oracle.com> (raw)
In-Reply-To: <20170814115000.GJ19063@dhcp22.suse.cz>
>> However, now thinking about it, I will change it to CONFIG_MEMBLOCK_DEBUG,
>> and let users decide what other debugging configs need to be enabled, as
>> this is also OK.
>
> Actually the more I think about it the more I am convinced that a kernel
> boot parameter would be better because it doesn't need the kernel to be
> recompiled and it is a single branch in not so hot path.
The main reason I do not like kernel parameter is that automated test
suits for every platform would need to be updated to include this new
parameter in order to test it.
Yet, I think it is important at least initially to test it on every
platform unconditionally when certain debug configs are enabled.
This patch series allows boot allocator to return uninitialized memory,
this behavior Linux never had before, but way too often firmware
explicitly zero all the memory before starting OS. Therefore, it would
be hard to debug issues that might be only seen during kinit type of
reboots.
In the future, when memory sizes will increase so that this memset will
become unacceptable even on debug kernels, it can always be removed, but
at least at that time we will know that the code has been tested for
many years.
next prev parent reply other threads:[~2017-08-14 14:03 UTC|newest]
Thread overview: 282+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-07 20:38 [v6 00/15] complete deferred page initialization Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` [v6 01/15] x86/mm: reserve only exiting low pages Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-11 8:07 ` Michal Hocko
2017-08-11 8:07 ` Michal Hocko
2017-08-11 8:07 ` Michal Hocko
2017-08-11 8:07 ` Michal Hocko
2017-08-11 15:24 ` Pasha Tatashin
2017-08-11 15:24 ` Pasha Tatashin
2017-08-11 15:24 ` Pasha Tatashin
2017-08-11 15:24 ` Pasha Tatashin
2017-08-14 11:40 ` Michal Hocko
2017-08-14 11:40 ` Michal Hocko
2017-08-14 11:40 ` Michal Hocko
2017-08-14 11:40 ` Michal Hocko
2017-08-14 13:30 ` Pasha Tatashin
2017-08-14 13:30 ` Pasha Tatashin
2017-08-14 13:30 ` Pasha Tatashin
2017-08-14 13:30 ` Pasha Tatashin
2017-08-14 13:55 ` Michal Hocko
2017-08-14 13:55 ` Michal Hocko
2017-08-14 13:55 ` Michal Hocko
2017-08-14 13:55 ` Michal Hocko
2017-08-17 15:37 ` Pasha Tatashin
2017-08-17 15:37 ` Pasha Tatashin
2017-08-17 15:37 ` Pasha Tatashin
2017-08-17 15:37 ` Pasha Tatashin
2017-08-07 20:38 ` [v6 02/15] x86/mm: setting fields in deferred pages Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-11 9:02 ` Michal Hocko
2017-08-11 9:02 ` Michal Hocko
2017-08-11 9:02 ` Michal Hocko
2017-08-11 9:02 ` Michal Hocko
2017-08-11 15:39 ` Pasha Tatashin
2017-08-11 15:39 ` Pasha Tatashin
2017-08-11 15:39 ` Pasha Tatashin
2017-08-11 15:39 ` Pasha Tatashin
2017-08-14 11:43 ` Michal Hocko
2017-08-14 11:43 ` Michal Hocko
2017-08-14 11:43 ` Michal Hocko
2017-08-14 11:43 ` Michal Hocko
2017-08-14 13:32 ` Pasha Tatashin
2017-08-14 13:32 ` Pasha Tatashin
2017-08-14 13:32 ` Pasha Tatashin
2017-08-14 13:32 ` Pasha Tatashin
2017-08-07 20:38 ` [v6 03/15] sparc64/mm: " Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` [v6 04/15] mm: discard memblock data later Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-11 9:32 ` Michal Hocko
2017-08-11 9:32 ` Michal Hocko
2017-08-11 9:32 ` Michal Hocko
2017-08-11 9:32 ` Michal Hocko
2017-08-11 9:50 ` Mel Gorman
2017-08-11 9:50 ` Mel Gorman
2017-08-11 9:50 ` Mel Gorman
2017-08-11 9:50 ` Mel Gorman
2017-08-11 15:49 ` Pasha Tatashin
2017-08-11 15:49 ` Pasha Tatashin
2017-08-11 15:49 ` Pasha Tatashin
2017-08-11 15:49 ` Pasha Tatashin
2017-08-11 16:04 ` Michal Hocko
2017-08-11 16:04 ` Michal Hocko
2017-08-11 16:04 ` Michal Hocko
2017-08-11 16:04 ` Michal Hocko
2017-08-11 16:22 ` Pasha Tatashin
2017-08-11 16:22 ` Pasha Tatashin
2017-08-11 16:22 ` Pasha Tatashin
2017-08-11 16:22 ` Pasha Tatashin
2017-08-14 11:36 ` Michal Hocko
2017-08-14 11:36 ` Michal Hocko
2017-08-14 11:36 ` Michal Hocko
2017-08-14 11:36 ` Michal Hocko
2017-08-14 13:35 ` Pasha Tatashin
2017-08-14 13:35 ` Pasha Tatashin
2017-08-14 13:35 ` Pasha Tatashin
2017-08-14 13:35 ` Pasha Tatashin
2017-08-11 19:00 ` Pasha Tatashin
2017-08-11 19:00 ` Pasha Tatashin
2017-08-11 19:00 ` Pasha Tatashin
2017-08-11 19:00 ` Pasha Tatashin
2017-08-14 11:34 ` Michal Hocko
2017-08-14 11:34 ` Michal Hocko
2017-08-14 11:34 ` Michal Hocko
2017-08-14 11:34 ` Michal Hocko
2017-08-14 13:39 ` Pasha Tatashin
2017-08-14 13:39 ` Pasha Tatashin
2017-08-14 13:39 ` Pasha Tatashin
2017-08-14 13:39 ` Pasha Tatashin
2017-08-14 13:42 ` Michal Hocko
2017-08-14 13:42 ` Michal Hocko
2017-08-14 13:42 ` Michal Hocko
2017-08-14 13:42 ` Michal Hocko
2017-08-07 20:38 ` [v6 05/15] mm: don't accessed uninitialized struct pages Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-11 9:37 ` Michal Hocko
2017-08-11 9:37 ` Michal Hocko
2017-08-11 9:37 ` Michal Hocko
2017-08-11 9:37 ` Michal Hocko
2017-08-11 15:55 ` Pasha Tatashin
2017-08-11 15:55 ` Pasha Tatashin
2017-08-11 15:55 ` Pasha Tatashin
2017-08-11 15:55 ` Pasha Tatashin
2017-08-14 11:47 ` Michal Hocko
2017-08-14 11:47 ` Michal Hocko
2017-08-14 11:47 ` Michal Hocko
2017-08-14 11:47 ` Michal Hocko
2017-08-14 13:51 ` Pasha Tatashin
2017-08-14 13:51 ` Pasha Tatashin
2017-08-14 13:51 ` Pasha Tatashin
2017-08-14 13:51 ` Pasha Tatashin
2017-08-17 15:28 ` Pasha Tatashin
2017-08-17 15:28 ` Pasha Tatashin
2017-08-17 15:28 ` Pasha Tatashin
2017-08-17 15:28 ` Pasha Tatashin
2017-08-17 15:43 ` Michal Hocko
2017-08-17 15:43 ` Michal Hocko
2017-08-17 15:43 ` Michal Hocko
2017-08-17 15:43 ` Michal Hocko
2017-08-15 9:33 ` Michal Hocko
2017-08-15 9:33 ` Michal Hocko
2017-08-15 9:33 ` Michal Hocko
2017-08-15 9:33 ` Michal Hocko
2017-08-07 20:38 ` [v6 06/15] sparc64: simplify vmemmap_populate Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` [v6 07/15] mm: defining memblock_virt_alloc_try_nid_raw Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-11 12:39 ` Michal Hocko
2017-08-11 12:39 ` Michal Hocko
2017-08-11 12:39 ` Michal Hocko
2017-08-11 12:39 ` Michal Hocko
2017-08-11 15:58 ` Pasha Tatashin
2017-08-11 15:58 ` Pasha Tatashin
2017-08-11 15:58 ` Pasha Tatashin
2017-08-11 15:58 ` Pasha Tatashin
2017-08-11 16:06 ` Michal Hocko
2017-08-11 16:06 ` Michal Hocko
2017-08-11 16:06 ` Michal Hocko
2017-08-11 16:06 ` Michal Hocko
2017-08-11 16:24 ` Pasha Tatashin
2017-08-11 16:24 ` Pasha Tatashin
2017-08-11 16:24 ` Pasha Tatashin
2017-08-11 16:24 ` Pasha Tatashin
2017-08-07 20:38 ` [v6 08/15] mm: zero struct pages during initialization Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-11 12:50 ` Michal Hocko
2017-08-11 12:50 ` Michal Hocko
2017-08-11 12:50 ` Michal Hocko
2017-08-11 12:50 ` Michal Hocko
2017-08-11 16:03 ` Pasha Tatashin
2017-08-11 16:03 ` Pasha Tatashin
2017-08-11 16:03 ` Pasha Tatashin
2017-08-11 16:03 ` Pasha Tatashin
2017-08-07 20:38 ` [v6 09/15] sparc64: optimized struct page zeroing Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-11 12:53 ` Michal Hocko
2017-08-11 12:53 ` Michal Hocko
2017-08-11 12:53 ` Michal Hocko
2017-08-11 12:53 ` Michal Hocko
2017-08-11 16:04 ` Pasha Tatashin
2017-08-11 16:04 ` Pasha Tatashin
2017-08-11 16:04 ` Pasha Tatashin
2017-08-11 16:04 ` Pasha Tatashin
2017-08-07 20:38 ` [v6 10/15] x86/kasan: explicitly zero kasan shadow memory Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` [v6 11/15] arm64/kasan: " Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-08 9:07 ` Will Deacon
2017-08-08 9:07 ` Will Deacon
2017-08-08 9:07 ` Will Deacon
2017-08-08 9:07 ` Will Deacon
2017-08-08 11:49 ` Pasha Tatashin
2017-08-08 11:49 ` Pasha Tatashin
2017-08-08 11:49 ` Pasha Tatashin
2017-08-08 11:49 ` Pasha Tatashin
2017-08-08 12:30 ` Will Deacon
2017-08-08 12:30 ` Will Deacon
2017-08-08 12:30 ` Will Deacon
2017-08-08 12:30 ` Will Deacon
2017-08-08 12:49 ` Pasha Tatashin
2017-08-08 12:49 ` Pasha Tatashin
2017-08-08 12:49 ` Pasha Tatashin
2017-08-08 12:49 ` Pasha Tatashin
2017-08-08 13:15 ` David Laight
2017-08-08 13:15 ` David Laight
2017-08-08 13:15 ` David Laight
2017-08-08 13:15 ` David Laight
2017-08-08 13:15 ` David Laight
2017-08-08 13:30 ` Pasha Tatashin
2017-08-08 13:30 ` Pasha Tatashin
2017-08-08 13:30 ` Pasha Tatashin
2017-08-08 13:30 ` Pasha Tatashin
2017-08-08 13:30 ` Pasha Tatashin
2017-08-07 20:38 ` [v6 12/15] mm: explicitly zero pagetable memory Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` [v6 13/15] mm: stop zeroing memory during allocation in vmemmap Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-11 13:04 ` Michal Hocko
2017-08-11 13:04 ` Michal Hocko
2017-08-11 13:04 ` Michal Hocko
2017-08-11 13:04 ` Michal Hocko
2017-08-11 16:11 ` Pasha Tatashin
2017-08-11 16:11 ` Pasha Tatashin
2017-08-11 16:11 ` Pasha Tatashin
2017-08-11 16:11 ` Pasha Tatashin
2017-08-07 20:38 ` [v6 14/15] mm: optimize early system hash allocations Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-11 13:05 ` Michal Hocko
2017-08-11 13:05 ` Michal Hocko
2017-08-11 13:05 ` Michal Hocko
2017-08-11 13:05 ` Michal Hocko
2017-08-11 16:13 ` Pasha Tatashin
2017-08-11 16:13 ` Pasha Tatashin
2017-08-11 16:13 ` Pasha Tatashin
2017-08-11 16:13 ` Pasha Tatashin
2017-08-07 20:38 ` [v6 15/15] mm: debug for raw alloctor Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-07 20:38 ` Pavel Tatashin
2017-08-11 13:08 ` Michal Hocko
2017-08-11 13:08 ` Michal Hocko
2017-08-11 13:08 ` Michal Hocko
2017-08-11 13:08 ` Michal Hocko
2017-08-11 16:18 ` Pasha Tatashin
2017-08-11 16:18 ` Pasha Tatashin
2017-08-11 16:18 ` Pasha Tatashin
2017-08-11 16:18 ` Pasha Tatashin
2017-08-14 11:50 ` Michal Hocko
2017-08-14 11:50 ` Michal Hocko
2017-08-14 11:50 ` Michal Hocko
2017-08-14 11:50 ` Michal Hocko
2017-08-14 14:01 ` Pasha Tatashin [this message]
2017-08-14 14:01 ` Pasha Tatashin
2017-08-14 14:01 ` Pasha Tatashin
2017-08-14 14:01 ` Pasha Tatashin
2017-08-15 9:36 ` Michal Hocko
2017-08-15 9:36 ` Michal Hocko
2017-08-15 9:36 ` Michal Hocko
2017-08-15 9:36 ` Michal Hocko
2017-08-11 7:58 ` [v6 00/15] complete deferred page initialization Michal Hocko
2017-08-11 7:58 ` Michal Hocko
2017-08-11 7:58 ` Michal Hocko
2017-08-11 7:58 ` Michal Hocko
2017-08-11 15:13 ` Pasha Tatashin
2017-08-11 15:13 ` Pasha Tatashin
2017-08-11 15:13 ` Pasha Tatashin
2017-08-11 15:13 ` Pasha Tatashin
2017-08-11 15:22 ` Michal Hocko
2017-08-11 15:22 ` Michal Hocko
2017-08-11 15:22 ` Michal Hocko
2017-08-11 15:22 ` Michal Hocko
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