From: Andreas Schwab <schwab@suse.de>
To: Minchan Kim <minchan@kernel.org>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, Jason Evans <je@fb.com>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Will Deacon <will.deacon@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
linux-arch@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
"\[4.5+\]" <stable@vger.kernel.org>
Subject: Re: [PATCH] mm: pmd dirty emulation in page fault handler
Date: Thu, 22 Dec 2016 23:12:32 +0100 [thread overview]
Message-ID: <8737hftxyn.fsf@suse.de> (raw)
In-Reply-To: <20161222145203.GA18970@bbox> (Minchan Kim's message of "Thu, 22 Dec 2016 23:52:03 +0900")
On Dez 22 2016, Minchan Kim <minchan@kernel.org> wrote:
> From b3ec95c0df91ad113525968a4a6b53030fd0b48d Mon Sep 17 00:00:00 2001
> From: Minchan Kim <minchan@kernel.org>
> Date: Thu, 22 Dec 2016 23:43:49 +0900
> Subject: [PATCH v2] mm: pmd dirty emulation in page fault handler
>
> Andreas reported [1] made a test in jemalloc hang in THP mode in arm64.
> http://lkml.kernel.org/r/mvmmvfy37g1.fsf@hawking.suse.de
>
> The problem is page fault handler supports only accessed flag emulation
> for THP page of SW-dirty/accessed architecture.
>
> This patch enables dirty-bit emulation for those architectures.
> Without it, MADV_FREE makes application hang by repeated fault forever.
>
> [1] b8d3c4c3009d, mm/huge_memory.c: don't split THP page when MADV_FREE syscall is called
Successfully tested a backport to 4.9.
Andreas.
--
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
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WARNING: multiple messages have this Message-ID (diff)
From: Andreas Schwab <schwab@suse.de>
To: Minchan Kim <minchan@kernel.org>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, Jason Evans <je@fb.com>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Will Deacon <will.deacon@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
"[4.5+]" <stable@vger.kernel.org>
Subject: Re: [PATCH] mm: pmd dirty emulation in page fault handler
Date: Thu, 22 Dec 2016 23:12:32 +0100 [thread overview]
Message-ID: <8737hftxyn.fsf@suse.de> (raw)
In-Reply-To: <20161222145203.GA18970@bbox> (Minchan Kim's message of "Thu, 22 Dec 2016 23:52:03 +0900")
On Dez 22 2016, Minchan Kim <minchan@kernel.org> wrote:
> From b3ec95c0df91ad113525968a4a6b53030fd0b48d Mon Sep 17 00:00:00 2001
> From: Minchan Kim <minchan@kernel.org>
> Date: Thu, 22 Dec 2016 23:43:49 +0900
> Subject: [PATCH v2] mm: pmd dirty emulation in page fault handler
>
> Andreas reported [1] made a test in jemalloc hang in THP mode in arm64.
> http://lkml.kernel.org/r/mvmmvfy37g1.fsf@hawking.suse.de
>
> The problem is page fault handler supports only accessed flag emulation
> for THP page of SW-dirty/accessed architecture.
>
> This patch enables dirty-bit emulation for those architectures.
> Without it, MADV_FREE makes application hang by repeated fault forever.
>
> [1] b8d3c4c3009d, mm/huge_memory.c: don't split THP page when MADV_FREE syscall is called
Successfully tested a backport to 4.9.
Andreas.
--
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."
--
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: Andreas Schwab <schwab@suse.de>
To: Minchan Kim <minchan@kernel.org>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, Jason Evans <je@fb.com>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Will Deacon <will.deacon@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
"[4.5+]" <stable@vger.kernel.org>
Subject: Re: [PATCH] mm: pmd dirty emulation in page fault handler
Date: Thu, 22 Dec 2016 23:12:32 +0100 [thread overview]
Message-ID: <8737hftxyn.fsf@suse.de> (raw)
Message-ID: <20161222221232.15x89yP2nGIBVPHSfjjvzgX74dvIk1aqPZQjVlejDdM@z> (raw)
In-Reply-To: <20161222145203.GA18970@bbox> (Minchan Kim's message of "Thu, 22 Dec 2016 23:52:03 +0900")
On Dez 22 2016, Minchan Kim <minchan@kernel.org> wrote:
> From b3ec95c0df91ad113525968a4a6b53030fd0b48d Mon Sep 17 00:00:00 2001
> From: Minchan Kim <minchan@kernel.org>
> Date: Thu, 22 Dec 2016 23:43:49 +0900
> Subject: [PATCH v2] mm: pmd dirty emulation in page fault handler
>
> Andreas reported [1] made a test in jemalloc hang in THP mode in arm64.
> http://lkml.kernel.org/r/mvmmvfy37g1.fsf@hawking.suse.de
>
> The problem is page fault handler supports only accessed flag emulation
> for THP page of SW-dirty/accessed architecture.
>
> This patch enables dirty-bit emulation for those architectures.
> Without it, MADV_FREE makes application hang by repeated fault forever.
>
> [1] b8d3c4c3009d, mm/huge_memory.c: don't split THP page when MADV_FREE syscall is called
Successfully tested a backport to 4.9.
Andreas.
--
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."
WARNING: multiple messages have this Message-ID (diff)
From: schwab@suse.de (Andreas Schwab)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] mm: pmd dirty emulation in page fault handler
Date: Thu, 22 Dec 2016 23:12:32 +0100 [thread overview]
Message-ID: <8737hftxyn.fsf@suse.de> (raw)
In-Reply-To: <20161222145203.GA18970@bbox> (Minchan Kim's message of "Thu, 22 Dec 2016 23:52:03 +0900")
On Dez 22 2016, Minchan Kim <minchan@kernel.org> wrote:
> From b3ec95c0df91ad113525968a4a6b53030fd0b48d Mon Sep 17 00:00:00 2001
> From: Minchan Kim <minchan@kernel.org>
> Date: Thu, 22 Dec 2016 23:43:49 +0900
> Subject: [PATCH v2] mm: pmd dirty emulation in page fault handler
>
> Andreas reported [1] made a test in jemalloc hang in THP mode in arm64.
> http://lkml.kernel.org/r/mvmmvfy37g1.fsf at hawking.suse.de
>
> The problem is page fault handler supports only accessed flag emulation
> for THP page of SW-dirty/accessed architecture.
>
> This patch enables dirty-bit emulation for those architectures.
> Without it, MADV_FREE makes application hang by repeated fault forever.
>
> [1] b8d3c4c3009d, mm/huge_memory.c: don't split THP page when MADV_FREE syscall is called
Successfully tested a backport to 4.9.
Andreas.
--
Andreas Schwab, SUSE Labs, schwab at suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."
next prev parent reply other threads:[~2016-12-22 22:12 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-21 23:48 [PATCH] mm: pmd dirty emulation in page fault handler Minchan Kim
2016-12-21 23:48 ` Minchan Kim
2016-12-21 23:48 ` Minchan Kim
2016-12-22 8:17 ` Kirill A. Shutemov
2016-12-22 8:17 ` Kirill A. Shutemov
2016-12-22 8:17 ` Kirill A. Shutemov
2016-12-22 8:17 ` Kirill A. Shutemov
2016-12-22 14:52 ` Minchan Kim
2016-12-22 14:52 ` Minchan Kim
2016-12-22 14:52 ` Minchan Kim
2016-12-22 14:52 ` Minchan Kim
2016-12-22 18:35 ` Kirill A. Shutemov
2016-12-22 18:35 ` Kirill A. Shutemov
2016-12-22 18:35 ` Kirill A. Shutemov
2016-12-22 22:12 ` Andreas Schwab [this message]
2016-12-22 22:12 ` Andreas Schwab
2016-12-22 22:12 ` Andreas Schwab
2016-12-22 22:12 ` Andreas Schwab
2016-12-23 9:17 ` Michal Hocko
2016-12-23 9:17 ` Michal Hocko
2016-12-23 9:17 ` Michal Hocko
2016-12-23 9:53 ` Minchan Kim
2016-12-23 9:53 ` Minchan Kim
2016-12-23 9:53 ` Minchan Kim
2016-12-23 9:53 ` Minchan Kim
2016-12-23 11:54 ` Michal Hocko
2016-12-23 11:54 ` Michal Hocko
2016-12-23 11:54 ` Michal Hocko
2016-12-23 14:01 ` Minchan Kim
2016-12-23 14:01 ` Minchan Kim
2016-12-23 14:01 ` Minchan Kim
2016-12-23 14:01 ` Minchan Kim
2016-12-23 14:53 ` Michal Hocko
2016-12-23 14:53 ` Michal Hocko
2016-12-23 14:53 ` Michal Hocko
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