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[2003:d8:2f44:3700:be07:9a67:67f7:24e6]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3b79c3abedesm1647621f8f.3.2025.07.31.01.38.49 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 31 Jul 2025 01:38:50 -0700 (PDT) Message-ID: <36cae7e8-97d0-4d53-968b-7f39b34fa5c0@redhat.com> Date: Thu, 31 Jul 2025 10:38:49 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/5] prctl: extend PR_SET_THP_DISABLE to optionally exclude VM_HUGEPAGE To: Lorenzo Stoakes , Usama Arif Cc: Andrew Morton , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, corbet@lwn.net, rppt@kernel.org, surenb@google.com, mhocko@suse.com, hannes@cmpxchg.org, baohua@kernel.org, shakeel.butt@linux.dev, riel@surriel.com, ziy@nvidia.com, laoar.shao@gmail.com, dev.jain@arm.com, baolin.wang@linux.alibaba.com, npache@redhat.com, Liam.Howlett@oracle.com, ryan.roberts@arm.com, vbabka@suse.cz, jannh@google.com, Arnd Bergmann , sj@kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, kernel-team@meta.com, Matthew Wilcox References: <20250725162258.1043176-1-usamaarif642@gmail.com> <20250725162258.1043176-2-usamaarif642@gmail.com> <8c5d607d-498e-4a34-a781-faafb3a5fdef@lucifer.local> <6eab6447-d9cb-4bad-aecc-cc5a5cd192bb@gmail.com> <41d8154f-7646-4cca-8b65-218827c1e7e4@lucifer.local> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: o3sxpw9ew8eeyydpnz5u5z6etrfzooyq X-Rspam-User: X-Rspamd-Queue-Id: D5A8440007 X-Rspamd-Server: rspam02 X-HE-Tag: 1753951138-945942 X-HE-Meta: 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 Bt72fU2z 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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: Thanks Lorenzo for the review, I'll leave handling all that to Usama from this point :) On 31.07.25 10:29, Lorenzo Stoakes wrote: > Just a ping on the man page stuff - you will do that right? :>) > I'm hoping that Usama can take over that part. If not, I'll handle it (had planned it for once it's in mm-stable / going upstream). [ ... ] >>>> +/* >>>> + * Don't disable THPs when explicitly advised (e.g., MADV_HUGEPAGE / >>>> + * VM_HUGEPAGE). >>>> + */ >>>> +# define PR_THP_DISABLE_EXCEPT_ADVISED (1 << 1) >>> >>> NO space after # please. >>> >> >> I think this is following the file convention, the space is there in other flags >> all over this file. I dont like the space as well. > > Yeah yuck. It's not a big deal, but ideally I'd prefer us to be sane even > if the rest of the header is less so here. I'm afraid us doing something different here will not make prctl() any better as a whole, so let's keep it consistent in this questionable file. > >> >>>> #define PR_GET_THP_DISABLE 42 >>>> >>>> /* >>>> diff --git a/kernel/sys.c b/kernel/sys.c >>>> index b153fb345ada..b87d0acaab0b 100644 >>>> --- a/kernel/sys.c >>>> +++ b/kernel/sys.c >>>> @@ -2423,6 +2423,50 @@ static int prctl_get_auxv(void __user *addr, unsigned long len) >>>> return sizeof(mm->saved_auxv); >>>> } >>>> >>>> +static int prctl_get_thp_disable(unsigned long arg2, unsigned long arg3, >>>> + unsigned long arg4, unsigned long arg5) >>>> +{ >>>> + unsigned long *mm_flags = ¤t->mm->flags; >>>> + >>>> + if (arg2 || arg3 || arg4 || arg5) >>>> + return -EINVAL; >>>> + >>> >>> Can we have a comment here about what we're doing below re: the return >>> value? >>> >> >> Do you mean add returning 1 for MMF_DISABLE_THP_COMPLETELY and 3 for MMF_DISABLE_THP_EXCEPT_ADVISED? > > Well more so something about we return essentially flags indicating what is > enabled or not, if bit 0 is set then it's disabled, if bit 1 is set then > it's that with the exception of VM_HUGEPAGE VMAs. We have that documented above the defines for flags etc. Maybe simply here: /* If disabled, we return "1 | flags", otherwise 0. */ -- Cheers, David / dhildenb