From: "zhaowuyun@wingtech.com" <zhaowuyun@wingtech.com>
To: akpm <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@kernel.org>,
mgorman <mgorman@techsingularity.net>,
minchan <minchan@kernel.org>, vinmenon <vinmenon@codeaurora.org>,
hannes <hannes@cmpxchg.org>,
"hillf.zj" <hillf.zj@alibaba-inc.com>,
linux-mm <linux-mm@kvack.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Hugh Dickins <hughd@google.com>
Subject: Re: Re: [PATCH] [PATCH] mm: disable preemption before swapcache_free
Date: Fri, 27 Jul 2018 14:07:49 +0800 [thread overview]
Message-ID: <20180727140749669129112@wingtech.com> (raw)
In-Reply-To: 20180726151118.db0cf8016e79bed849e549f9@linux-foundation.org
>On Thu, 26 Jul 2018 15:03:23 +0800 "zhaowuyun@wingtech.com" <zhaowuyun@wingtech.com> wrote:
>
>> >On Thu 26-07-18 10:21:40, zhaowuyun@wingtech.com wrote:
>> >[...]
>> >> Our project really needs a fix to this issue
>> >
>> >Could you be more specific why? My understanding is that RT tasks
>> >usually have all the memory mlocked otherwise all the real time
>> >expectations are gone already.
>> >--
>> >Michal Hocko
>> >SUSE Labs
>>
>>
>> The RT thread is created by a process with normal priority, and the process was sleep,
>> then some task needs the RT thread to do something, so the process create this thread, and set it to RT policy.
>> I think that is the reason why RT task would read the swap.
>
>A simpler bandaid might be to replace the cond_resched() with msleep(1).
Thanks for the suggestion, we will try that.
--------------
zhaowuyun@wingtech.com
next prev parent reply other threads:[~2018-07-27 6:08 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-25 6:37 [PATCH] [PATCH] mm: disable preemption before swapcache_free zhaowuyun
2018-07-25 6:40 ` zhaowuyun
2018-07-25 7:40 ` Michal Hocko
2018-07-25 7:57 ` zhaowuyun
2018-07-25 8:21 ` Michal Hocko
2018-07-25 9:53 ` zhaowuyun
2018-07-25 10:34 ` Michal Hocko
2018-07-25 11:17 ` zhaowuyun
2018-07-25 10:32 ` Michal Hocko
2018-07-25 21:16 ` Andrew Morton
2018-07-26 2:21 ` zhaowuyun
2018-07-26 6:06 ` Michal Hocko
2018-07-26 7:03 ` zhaowuyun
2018-07-26 7:44 ` Michal Hocko
2018-07-26 22:11 ` Andrew Morton
2018-07-27 6:07 ` zhaowuyun [this message]
2018-08-04 23:07 ` Hugh Dickins
2018-08-07 2:15 ` zhaowuyun
2018-08-07 3:23 ` Hugh Dickins
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