Received-SPF: pass (google.com: domain of linux-kernel+bounces-81137-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45e3:2400::1 as permitted sender) client-ip=2604:1380:45e3:2400::1;
Message-ID: <7670235f-60b8-46b4-a30f-606f798eeda4@suse.cz>
Date: Mon, 26 Feb 2024 11:12:43 +0100
Precedence: bulk
MIME-Version: 1.0
User-Agent: Mozilla Thunderbird
Subject: Re: regression/bisected commit
 773688a6cb24b0b3c2ba40354d883348a2befa38 make my system completely unusable
 under high load
Content-Language: en-US
To: Marco Elver <elver@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
 Mikhail Gavrilov <mikhail.v.gavrilov@gmail.com>,
 Andrey Konovalov <andreyknvl@gmail.com>, glider@google.com,
 dvyukov@google.com, eugenis@google.com, Oscar Salvador <osalvador@suse.de>,
 Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
 Linux Memory Management List <linux-mm@kvack.org>
References: <CABXGCsOzpRPZGg23QqJAzKnqkZPKzvieeg=W7sgjgi3q0pBo0g@mail.gmail.com>
 <CABXGCsM9BSD+SYFkvkYxmcrZL+aUfUb_M-rjNJhzb2cYHQr5ww@mail.gmail.com>
 <CANpmjNNXKiM0j4mR-Rr2KALhgz87=QjCOomEymNMWjtos=Z3Ug@mail.gmail.com>
 <CANpmjNOnbNw2fRL3_depaAgt81p-VpHh5_O_26kyxofjECgsFQ@mail.gmail.com>
 <CABXGCsPB-KEbE+SfymVmqfiomFVngFL2Je81Qyhw1F5_aZX-TQ@mail.gmail.com>
 <CABXGCsO5dcEuorLAXR3CFzDVyAWNk4_YfqCh=UJddfzpWF7hNg@mail.gmail.com>
 <CANpmjNPsdM2HrRFgEHYxX1seT2fbOFDuO6Ci-qF3X2y=9_PD1A@mail.gmail.com>
 <91c50335-e7b6-4ae1-9dad-a0c990b52021@suse.cz>
 <20240219152836.11d36709c594e66fe3037f2d@linux-foundation.org>
 <7e31accb-db01-486f-afb8-18a3f5402d00@suse.cz>
 <CABXGCsOHswLa5rd_Q7kHDHESb=BtqB+F=LV7Wvv+qoRxrqCboA@mail.gmail.com>
 <20240220093011.bf84486d704c3814079c2aa0@linux-foundation.org>
 <96c51d35-15ce-42d0-b81b-7e76044e1f2b@suse.cz>
 <CANpmjNMObiX5X721DERccn16aMW+WMPz+wvLKv=UdaQi3XOMwA@mail.gmail.com>
 <CANpmjNPP=c4ZfJmWFexR=03Lk4gGMr7yPW=j81WAnM_vCSCwCQ@mail.gmail.com>
From: Vlastimil Babka <vbabka@suse.cz>
In-Reply-To: <CANpmjNPP=c4ZfJmWFexR=03Lk4gGMr7yPW=j81WAnM_vCSCwCQ@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit

On 2/26/24 10:25, Marco Elver wrote:
> On Tue, 20 Feb 2024 at 19:51, Marco Elver <elver@google.com> wrote:
>>
>> While it would be nice if 6.8 would not regress over 6.7 (performance
>> is mostly fixed, memory usage is not), waiting for confirmation what
>> the rcutorture issue from the bot is about might be good.
>>
>> Mikhail: since you are testing mainline, in about 4 weeks the fixes
>> should then reach 6.9-rc in the next merge window. Until then, if it's
>> not too difficult for you, you can apply those 2 patches in your own
>> tree.
> 
> There are more issues that are fixed by "[PATCH v2 1/2] stackdepot:
> use variable size records for non-evictable entries". See
> https://lore.kernel.org/all/ZdxYXQdZDuuhcqiv@elver.google.com/
> 
> This will eventually reach stable, but it might be good to reconsider
> mainlining it earlier.

I believe I can see that patch, together with "kasan: revert eviction of
stack traces in generic mode" in mm-hotfixes-stable so it should be on track
for 6.8.

> Thanks,
> -- Marco