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Howlett" To: Matthew Wilcox Cc: Vlastimil Babka , Suren Baghdasaryan , akpm@linux-foundation.org, lorenzo.stoakes@oracle.com, mhocko@suse.com, hannes@cmpxchg.org, mjguzik@gmail.com, oliver.sang@intel.com, mgorman@techsingularity.net, david@redhat.com, peterx@redhat.com, oleg@redhat.com, dave@stgolabs.net, paulmck@kernel.org, brauner@kernel.org, dhowells@redhat.com, hdanton@sina.com, hughd@google.com, minchan@google.com, jannh@google.com, shakeel.butt@linux.dev, souravpanda@google.com, pasha.tatashin@soleen.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@android.com Subject: Re: [PATCH v2 4/5] mm: make vma cache SLAB_TYPESAFE_BY_RCU Message-ID: Mail-Followup-To: "Liam R. Howlett" , Matthew Wilcox , Vlastimil Babka , Suren Baghdasaryan , akpm@linux-foundation.org, lorenzo.stoakes@oracle.com, mhocko@suse.com, hannes@cmpxchg.org, mjguzik@gmail.com, oliver.sang@intel.com, mgorman@techsingularity.net, david@redhat.com, peterx@redhat.com, oleg@redhat.com, dave@stgolabs.net, paulmck@kernel.org, brauner@kernel.org, dhowells@redhat.com, hdanton@sina.com, hughd@google.com, minchan@google.com, jannh@google.com, shakeel.butt@linux.dev, souravpanda@google.com, pasha.tatashin@soleen.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@android.com References: <20241112194635.444146-1-surenb@google.com> <20241112194635.444146-5-surenb@google.com> <54b8d0b9-a1c7-4c1b-a588-2e5308a977fb@suse.cz> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: NeoMutt/20240425 X-ClientProxiedBy: YT4P288CA0078.CANP288.PROD.OUTLOOK.COM (2603:10b6:b01:d0::11) To MW5PR10MB5764.namprd10.prod.outlook.com (2603:10b6:303:190::15) 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Matthew Wilcox [241113 08:57]: > On Wed, Nov 13, 2024 at 07:38:02AM -0500, Liam R. Howlett wrote: > > > Hi, I was wondering if we actually need the detached flag. Couldn't > > > "detached" simply mean vma->vm_mm == NULL and we save 4 bytes? Do we ever > > > need a vma that's detached but still has a mm pointer? I'd hope the places > > > that set detached to false have the mm pointer around so it's not inconvenient. > > > > I think the gate vmas ruin this plan. > > But the gate VMAs aren't to be found in the VMA tree. Used to be that > was because the VMA tree was the injective RB tree and so VMAs could > only be in one tree at a time. We could change that now! \o/ > > Anyway, we could use (void *)1 instead of NULL to indicate a "detached" > VMA if we need to distinguish between a detached VMA and a gate VMA. I was thinking a pointer to itself vma->vm_mm = vma, then a check for this, instead of null like we do today. Either way, we should make it a function so it's easier to reuse for whatever we need in the future, wdyt?