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[80.230.68.31]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-493e0078d49sm49438995e9.0.2026.07.07.03.18.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Jul 2026 03:18:19 -0700 (PDT) Date: Tue, 7 Jul 2026 06:18:16 -0400 From: "Michael S. Tsirkin" To: Sourav Panda Cc: muchun.song@linux.dev, osalvador@suse.de, akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, mhklinux@outlook.com, fvdl@google.com, gthelen@google.com, mike.kravetz@oracle.com, pasha.tatashin@soleen.com, rientjes@google.com, riel@surriel.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-doc@vger.kernel.org Subject: Re: [PATCH 6/6] mm/hugetlb: support free page reporting for cached hugepages Message-ID: <20260707032839-mutt-send-email-mst@kernel.org> References: <20260707064235.1386552-1-souravpanda@google.com> <20260707064235.1386552-7-souravpanda@google.com> MIME-Version: 1.0 In-Reply-To: <20260707064235.1386552-7-souravpanda@google.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: HoOP2jXuLK31SN7zHeNV7T7sYGy2UcHN8axK1SFCpPQ_1783419501 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 2464BC0006 X-Stat-Signature: r53oc4dairepfqgw5j7i8s1dudh4w8ta X-HE-Tag: 1783419504-173530 X-HE-Meta: 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 Kq4xVBZX 9Bk9AY/EjgAMjlL/evDAuLL9Z/tbXWs3Xy3zzfcmWff0bMSwYJ7D6fbzvy1gPcVC0f2wq+6XnKVmGajmkk41PWkFmEPf/ABOd8kZuCaNcpig7x1g2FsvOzT/L6Tta3NppmqtofiEBX/W1Oamzj5FL1xQqbs8yrV/b55WLxa8PTK1fboZMKdZ7IwcPeqNpnriY6w5Q/glVMuQdh8Kn4YS2lK7ClScATKfD7zsefbi2UuHJkiBMWhH3dtQFpzhE8NqgSFtO2BV7pKE8RaAHtuJ7jA08UcOkKaddc0Q3gi8gYs/4prQJKwDCICU7ujH+kKMyvTIk Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Jul 07, 2026 at 06:42:35AM +0000, Sourav Panda wrote: > Implement free page reporting for the HugeTLB dynamic cache. > > Register HugeTLB hstates with the page reporting framework if they > support caching. > > When pages are added to the cache (either via recycling in > free_huge_folio or direct population via sysfs nr_cached_hugepages), > trigger a page reporting cycle. > > Page reporting isolates pages from the cache list, reports them to the > hypervisor via virtio-balloon, and then drains them back to the cache > list, marking them as reported (HPG_reported). > > If a page is allocated from the cache, or reclaimed, clear the reported > flag. > > Signed-off-by: Sourav Panda So if you are going to look into this, I feel the 1st step should be reporting pages from hugepage_freelists - this can be done independently. -- MST