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From: Minchan Kim <minchan@kernel.org>
To: Andreas Schwab <schwab@suse.de>
Cc: <linux-arm-kernel@lists.infradead.org>,
	<linux-kernel@vger.kernel.org>, <mbrugger@suse.de>,
	<linux-mm@kvack.org>, Jason Evans <je@fb.com>
Subject: Re: jemalloc testsuite stalls in memset
Date: Fri, 16 Dec 2016 15:39:40 +0900	[thread overview]
Message-ID: <20161216063940.GA1334@bbox> (raw)
In-Reply-To: <mvm4m2535pc.fsf@hawking.suse.de>

Hello,

On Thu, Dec 15, 2016 at 10:24:47AM +0100, Andreas Schwab wrote:
> On Dez 15 2016, Minchan Kim <minchan@kernel.org> wrote:
> 
> > You mean program itself access the address(ie, 0xffffb7400000) is hang
> > while access the address from the debugger is OK?
> 
> Yes.
> 
> > Can you reproduce it easily?
> 
> 100%
> 
> > Did you test it in real machine or qemu on x86?
> 
> Both real and kvm.
> 
> > Could you show me how I can reproduce it?
> 
> Just run make check.
> 
> > I want to test it in x86 machine, first of all.
> > Unfortunately, I don't have any aarch64 platform now so maybe I have to
> > run it on qemu on x86 until I can set up aarch64 platform if it is reproducible
> > on real machine only.
> >
> >> 
> >> The kernel has been configured with transparent hugepages.
> >> 
> >> CONFIG_TRANSPARENT_HUGEPAGE=y
> >> CONFIG_TRANSPARENT_HUGEPAGE_ALWAYS=y
> >> # CONFIG_TRANSPARENT_HUGEPAGE_MADVISE is not set
> >> CONFIG_TRANSPARENT_HUGE_PAGECACHE=y
> >
> > What's the exact kernel version?
> 
> Anything >= your commit.

Thanks for the info. I cannot setup testing enviroment but when I read code,
it seems we need pmd_wrprotect for non-hardware dirty architecture.

Below helps?

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index e10a4fe..dc37c9a 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1611,6 +1611,7 @@ int madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
 			tlb->fullmm);
 		orig_pmd = pmd_mkold(orig_pmd);
 		orig_pmd = pmd_mkclean(orig_pmd);
+		orig_pmd = pmd_wrprotect(orig_pmd);
 
 		set_pmd_at(mm, addr, pmd, orig_pmd);
 		tlb_remove_pmd_tlb_entry(tlb, pmd, addr);

WARNING: multiple messages have this Message-ID
From: Minchan Kim <minchan@kernel.org>
To: Andreas Schwab <schwab@suse.de>
Cc: linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, mbrugger@suse.de,
	linux-mm@kvack.org, Jason Evans <je@fb.com>
Subject: Re: jemalloc testsuite stalls in memset
Date: Fri, 16 Dec 2016 15:39:40 +0900	[thread overview]
Message-ID: <20161216063940.GA1334@bbox> (raw)
In-Reply-To: <mvm4m2535pc.fsf@hawking.suse.de>

Hello,

On Thu, Dec 15, 2016 at 10:24:47AM +0100, Andreas Schwab wrote:
> On Dez 15 2016, Minchan Kim <minchan@kernel.org> wrote:
> 
> > You mean program itself access the address(ie, 0xffffb7400000) is hang
> > while access the address from the debugger is OK?
> 
> Yes.
> 
> > Can you reproduce it easily?
> 
> 100%
> 
> > Did you test it in real machine or qemu on x86?
> 
> Both real and kvm.
> 
> > Could you show me how I can reproduce it?
> 
> Just run make check.
> 
> > I want to test it in x86 machine, first of all.
> > Unfortunately, I don't have any aarch64 platform now so maybe I have to
> > run it on qemu on x86 until I can set up aarch64 platform if it is reproducible
> > on real machine only.
> >
> >> 
> >> The kernel has been configured with transparent hugepages.
> >> 
> >> CONFIG_TRANSPARENT_HUGEPAGE=y
> >> CONFIG_TRANSPARENT_HUGEPAGE_ALWAYS=y
> >> # CONFIG_TRANSPARENT_HUGEPAGE_MADVISE is not set
> >> CONFIG_TRANSPARENT_HUGE_PAGECACHE=y
> >
> > What's the exact kernel version?
> 
> Anything >= your commit.

Thanks for the info. I cannot setup testing enviroment but when I read code,
it seems we need pmd_wrprotect for non-hardware dirty architecture.

Below helps?

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index e10a4fe..dc37c9a 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1611,6 +1611,7 @@ int madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
 			tlb->fullmm);
 		orig_pmd = pmd_mkold(orig_pmd);
 		orig_pmd = pmd_mkclean(orig_pmd);
+		orig_pmd = pmd_wrprotect(orig_pmd);
 
 		set_pmd_at(mm, addr, pmd, orig_pmd);
 		tlb_remove_pmd_tlb_entry(tlb, pmd, addr);

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WARNING: multiple messages have this Message-ID
From: minchan@kernel.org (Minchan Kim)
To: linux-arm-kernel@lists.infradead.org
Subject: jemalloc testsuite stalls in memset
Date: Fri, 16 Dec 2016 15:39:40 +0900	[thread overview]
Message-ID: <20161216063940.GA1334@bbox> (raw)
In-Reply-To: <mvm4m2535pc.fsf@hawking.suse.de>

Hello,

On Thu, Dec 15, 2016 at 10:24:47AM +0100, Andreas Schwab wrote:
> On Dez 15 2016, Minchan Kim <minchan@kernel.org> wrote:
> 
> > You mean program itself access the address(ie, 0xffffb7400000) is hang
> > while access the address from the debugger is OK?
> 
> Yes.
> 
> > Can you reproduce it easily?
> 
> 100%
> 
> > Did you test it in real machine or qemu on x86?
> 
> Both real and kvm.
> 
> > Could you show me how I can reproduce it?
> 
> Just run make check.
> 
> > I want to test it in x86 machine, first of all.
> > Unfortunately, I don't have any aarch64 platform now so maybe I have to
> > run it on qemu on x86 until I can set up aarch64 platform if it is reproducible
> > on real machine only.
> >
> >> 
> >> The kernel has been configured with transparent hugepages.
> >> 
> >> CONFIG_TRANSPARENT_HUGEPAGE=y
> >> CONFIG_TRANSPARENT_HUGEPAGE_ALWAYS=y
> >> # CONFIG_TRANSPARENT_HUGEPAGE_MADVISE is not set
> >> CONFIG_TRANSPARENT_HUGE_PAGECACHE=y
> >
> > What's the exact kernel version?
> 
> Anything >= your commit.

Thanks for the info. I cannot setup testing enviroment but when I read code,
it seems we need pmd_wrprotect for non-hardware dirty architecture.

Below helps?

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index e10a4fe..dc37c9a 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1611,6 +1611,7 @@ int madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
 			tlb->fullmm);
 		orig_pmd = pmd_mkold(orig_pmd);
 		orig_pmd = pmd_mkclean(orig_pmd);
+		orig_pmd = pmd_wrprotect(orig_pmd);
 
 		set_pmd_at(mm, addr, pmd, orig_pmd);
 		tlb_remove_pmd_tlb_entry(tlb, pmd, addr);

  reply	other threads:[~2016-12-16  6:39 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-12-14 14:34 jemalloc testsuite stalls in memset Andreas Schwab
2016-12-14 14:34 ` Andreas Schwab
2016-12-14 23:50 ` Minchan Kim
2016-12-14 23:50   ` Minchan Kim
2016-12-14 23:50   ` Minchan Kim
2016-12-15  9:24   ` Andreas Schwab
2016-12-15  9:24     ` Andreas Schwab
2016-12-15  9:24     ` Andreas Schwab
2016-12-16  6:39     ` Minchan Kim [this message]
2016-12-16  6:39       ` Minchan Kim
2016-12-16  6:39       ` Minchan Kim
2016-12-16 14:16       ` Andreas Schwab
2016-12-16 14:16         ` Andreas Schwab
2016-12-16 14:16         ` Andreas Schwab
2016-12-21 23:54         ` Minchan Kim
2016-12-21 23:54           ` Minchan Kim
2016-12-21 23:54           ` Minchan Kim

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