linux-kernel - Re: jemalloc testsuite stalls in memset

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Date:   Thu, 15 Dec 2016 10:24:47 +0100
From:   Andreas Schwab <schwab@...e.de>
To:     Minchan Kim <minchan@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        mbrugger@...e.de, linux-mm@...ck.org, Jason Evans <je@...com>
Subject: Re: jemalloc testsuite stalls in memset

On Dez 15 2016, Minchan Kim <minchan@...nel.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.

> I don't think it's HUGE_PAGECACHE problem but to narrow down the scope,
> could you test it without CONFIG_TRANSPARENT_HUGE_PAGECACHE?

That cannot be deselected.

Andreas.

-- 
Andreas Schwab, SUSE Labs, schwab@...e.de
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"And now for something completely different."