From: Vlastimil Babka <vbabka@suse.cz>
To: Charan Teja Kalla <charante@codeaurora.org>,
akpm@linux-foundation.org, nigupta@nvidia.com,
hannes@cmpxchg.org, corbet@lwn.net, mcgrof@kernel.org,
keescook@chromium.org, yzaikin@google.com, aarcange@redhat.com,
cl@linux.com, xi.fengfei@h3c.com, mchehab+huawei@kernel.org,
andrew.a.klychkov@gmail.com, dave.hansen@linux.intel.com,
bhe@redhat.com, iamjoonsoo.kim@lge.com, mateusznosek0@gmail.com,
sh_def@163.com, vinmenon@codeaurora.org
Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH v3 1/2] mm: compaction: support triggering of proactive compaction by user
Date: Thu, 17 Jun 2021 16:37:20 +0200 [thread overview]
Message-ID: <0d516cfa-f41c-5ccc-26aa-67871f23dcd3@suse.cz> (raw)
In-Reply-To: <0ca491e8-6d3a-6537-dfa0-ece5f3bb6a1e@codeaurora.org>
On 6/17/21 9:30 AM, Charan Teja Kalla wrote:
> Thanks Vlastimil for your inputs!!
>
> On 6/16/2021 5:29 PM, Vlastimil Babka wrote:
>>> This triggering of proactive compaction is done on a write to
>>> sysctl.compaction_proactiveness by user.
>>>
>>> [1]https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=facdaa917c4d5a376d09d25865f5a863f906234a
>>>
>>> Signed-off-by: Charan Teja Reddy <charante@codeaurora.org>
>>> ---
>>> changes in V2:
>> You forgot to also summarize the changes. Please do in next version.
>
> I think we can get rid off 'proactive_defer' thread variable with the
> timeout approach you suggested. But it is still requires to have one
> additional variable 'proactive_compact_trigger', which main purpose is
> to decide if the kcompactd wakeup is for proactive compaction or not.
> Please see below code:
> if (wait_event_freezable_timeout() && !proactive_compact_trigger) {
> // do the non-proactive work
> continue
> }
> // do the proactive work
> .................
>
> Thus I feel that on writing new proactiveness, it is required to do
> wakeup_kcomppactd() + set a flag that this wakeup is for proactive work.
>
> Am I failed to get your point here?
The check whether to do non-proactive work is already guarded by
kcompactd_work_requested(), which looks at pgdat->kcompactd_max_order and this
is set by wakeup_kcompactd().
So with a plain wakeup where we don't set pgdat->kcompactd_max_order will make
it consider proactive work instead and we don't need another trigger variable
AFAICS.
next prev parent reply other threads:[~2021-06-17 14:37 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-31 10:54 [PATCH V3 0/2] mm: compaction: proactive compaction trigger by user Charan Teja Reddy
2021-05-31 10:54 ` [PATCH v3 1/2] mm: compaction: support triggering of proactive compaction " Charan Teja Reddy
2021-06-07 10:38 ` Charan Teja Kalla
2021-06-14 14:57 ` Charan Teja Kalla
2021-06-16 11:59 ` Vlastimil Babka
2021-06-17 7:30 ` Charan Teja Kalla
2021-06-17 14:37 ` Vlastimil Babka [this message]
2021-06-17 16:05 ` Charan Teja Kalla
2021-06-17 16:17 ` Vlastimil Babka
2021-05-31 10:54 ` [PATCH v3 2/2] mm: compaction: fix wakeup logic of proactive compaction Charan Teja Reddy
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