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Mon, 09 Jun 2025 14:40:01 +0800 Message-ID: <6bb2a3f5-d10c-4a0a-abd3-d319dc70aec8@linux.alibaba.com> Date: Mon, 9 Jun 2025 14:39:59 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v7 12/12] Documentation: mm: update the admin guide for mTHP collapse To: Dev Jain , Nico Pache Cc: linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, david@redhat.com, ziy@nvidia.com, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, ryan.roberts@arm.com, corbet@lwn.net, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, akpm@linux-foundation.org, baohua@kernel.org, willy@infradead.org, peterx@redhat.com, wangkefeng.wang@huawei.com, usamaarif642@gmail.com, sunnanyong@huawei.com, vishal.moola@gmail.com, thomas.hellstrom@linux.intel.com, yang@os.amperecomputing.com, kirill.shutemov@linux.intel.com, aarcange@redhat.com, raquini@redhat.com, anshuman.khandual@arm.com, catalin.marinas@arm.com, tiwai@suse.de, will@kernel.org, dave.hansen@linux.intel.com, jack@suse.cz, cl@gentwo.org, jglisse@google.com, surenb@google.com, zokeefe@google.com, hannes@cmpxchg.org, rientjes@google.com, mhocko@suse.com, rdunlap@infradead.org, Bagas Sanjaya References: <20250515032226.128900-1-npache@redhat.com> <20250515032226.128900-13-npache@redhat.com> <4a2c359e-79d9-447b-a43e-164333d08319@linux.alibaba.com> From: Baolin Wang In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: B16EA40004 X-Rspamd-Server: rspam09 X-Stat-Signature: i4airxp97ty5ga14cy7fjxx8bgo3qgkt X-HE-Tag: 1749451217-283259 X-HE-Meta: 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 Nq5KMEqQ 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2025/6/9 13:26, Dev Jain wrote: > > On 09/06/25 8:36 am, Baolin Wang wrote: >> >> >> On 2025/6/9 03:50, Nico Pache wrote: >>> On Sat, Jun 7, 2025 at 8:35 AM Dev Jain wrote: >>>> >>>> >>>> On 07/06/25 6:27 pm, Nico Pache wrote: >>>>> On Sat, Jun 7, 2025 at 12:45 AM Dev Jain wrote: >>>>>> >>>>>> On 15/05/25 8:52 am, Nico Pache wrote: >>>>>> >>>>>> Now that we can collapse to mTHPs lets update the admin guide to >>>>>> reflect these changes and provide proper guidence on how to >>>>>> utilize it. >>>>>> >>>>>> Reviewed-by: Bagas Sanjaya >>>>>> Signed-off-by: Nico Pache >>>>>> --- >>>>>>    Documentation/admin-guide/mm/transhuge.rst | 14 +++++++++++++- >>>>>>    1 file changed, 13 insertions(+), 1 deletion(-) >>>>>> >>>>>> diff --git a/Documentation/admin-guide/mm/transhuge.rst >>>>>> b/Documentation/admin-guide/mm/transhuge.rst >>>>>> index dff8d5985f0f..5c63fe51b3ad 100644 >>>>>> --- a/Documentation/admin-guide/mm/transhuge.rst >>>>>> +++ b/Documentation/admin-guide/mm/transhuge.rst >>>>>> >>>>>> >>>>>> We need to modify/remove the following paragraph: >>>>>> >>>>>> khugepaged currently only searches for opportunities to collapse to >>>>>> PMD-sized THP and no attempt is made to collapse to other THP >>>>>> sizes. >>>>> On this version this is currently still true, but once I add Baolin's >>>>> patch it will not be true. Thanks for the reminder :) >>>> >>>> You referenced Baolin's patch in the other email too, can you send >>>> the link, >>>> or the patch? >>> >>> He didn't send it to the mailing list, but rather off chain to all the >>> recipients of this series. You should have it in your email look for >>> >>> Subject: "mm: khugepaged: allow khugepaged to check all anonymous mTHP >>> orders" and "mm: khugepaged: kick khugepaged for enabling >>> none-PMD-sized mTHPs" >> >> You can find them at the following link: >> https://lore.kernel.org/all/ac9ed6d71b439611f9c94b3506a8ce975d4636e9.1748435162.git.baolin.wang@linux.alibaba.com/ > > > Thanks! Looks quite similar to my approach. Sorry, I didn't see your previous patches (if I had, it would have saved me a lot of testing time:) ).