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[80.230.48.7]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4548e6a5b65sm25227071f8f.8.2026.05.11.02.03.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 May 2026 02:03:57 -0700 (PDT) Date: Mon, 11 May 2026 05:03:52 -0400 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: "David Hildenbrand (Arm)" , Jason Wang , Xuan Zhuo , Eugenio =?utf-8?B?UMOpcmV6?= , Muchun Song , Oscar Salvador , Andrew Morton , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Hugh Dickins , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Christoph Lameter , David Rientjes , Roman Gushchin , Harry Yoo , Axel Rasmussen , Yuanchu Xie , Wei Xu , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , virtualization@lists.linux.dev, linux-mm@kvack.org, Andrea Arcangeli Subject: [PATCH resend v6 23/30] mm: page_reporting: add flush parameter with page budget Message-ID: <4e2e1015d22d5aeb3a60d74cc08b56e49363d3d8.1778489843.git.mst@redhat.com> References: MIME-Version: 1.0 In-Reply-To: X-Mailer: git-send-email 2.27.0.106.g8ac3dc51b1 X-Mutt-Fcc: =sent X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: LcoigdMZXQsvphTyFeMhYCo74T7Vlv0qZBnBhETsAbI_1778490239 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: AC0F540005 X-Stat-Signature: znciym9hw86iuzeboimcxfbsr55njanz X-Rspam-User: X-HE-Tag: 1778490241-687636 X-HE-Meta: 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 Yzq8eq0L Psc0uU/QqJYU1Ip+jmKGqXZQKZetFS/nYMGlORMcufoRaTZpKzj28ZgH6ILkHp/gYDKyf3jujzk6iE7djAygNu5xhWJN1cw4+B6WQ9+zcGzFHbaGjHWQWu1X7OgYEQR/GNTzgSjp0YnCKrKB4ulRpaPRxjYvVDfzzZq47o41cQyLVt5Cyem2qNgdRSnybEjBNjhKwUmQqOjnloJ8kWiCRdHmpTHALcZQuh8gQvI47iWPXvi4kOlYxpcbel1ZKvNLtwcgpBrMTOLST5h8mejL4KdJS1HXpf4VtYB0u7S9y1E75BAbb7/yM2zhtkNJE7+AK56fMep3v39AG6wknyAmThm3CxvX6ND0CKeDhCZALEpDRb/AOfgYKbKyhDM7lAqnBTYsAKxLFLv0WO0y+/c+48DjjpMz28hoJC8/ejZ5X3fA7bcSbAGThgRbyuCpLS8yGU9sq Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add a write-only module parameter 'flush' that triggers immediate page reporting. The value specifies a page budget: at least this many pages (at page_reporting_order) will be reported, or all unreported pages if fewer remain. The actual number reported may exceed the budget since each reporting pass processes a full cycle across all zones. This is helpful when there is a lot of memory freed quickly, and a single cycle may not process all free pages due to internal budget limits. echo 512 > /sys/module/page_reporting/parameters/flush Signed-off-by: Michael S. Tsirkin Assisted-by: Claude:claude-opus-4-6 Assisted-by: cursor-agent:GPT-5.4-xhigh --- mm/page_reporting.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/mm/page_reporting.c b/mm/page_reporting.c index 6c957a9daeef..f4a0e27ac7fb 100644 --- a/mm/page_reporting.c +++ b/mm/page_reporting.c @@ -358,6 +358,48 @@ static void page_reporting_process(struct work_struct *work) static DEFINE_MUTEX(page_reporting_mutex); DEFINE_STATIC_KEY_FALSE(page_reporting_enabled); +static int page_reporting_flush_set(const char *val, + const struct kernel_param *kp) +{ + struct page_reporting_dev_info *prdev; + unsigned int budget; + int err; + + err = kstrtouint(val, 0, &budget); + if (err) + return err; + if (!budget) + return 0; + + mutex_lock(&page_reporting_mutex); + prdev = rcu_dereference_protected(pr_dev_info, + lockdep_is_held(&page_reporting_mutex)); + if (prdev) { + unsigned int reported; + + for (reported = 0; reported < budget; + reported += prdev->capacity) { + flush_delayed_work(&prdev->work); + __page_reporting_request(prdev); + flush_delayed_work(&prdev->work); + if (atomic_read(&prdev->state) == PAGE_REPORTING_IDLE) + break; + if (signal_pending(current)) + break; + } + } + mutex_unlock(&page_reporting_mutex); + return 0; +} + +static const struct kernel_param_ops flush_ops = { + .set = page_reporting_flush_set, + .get = param_get_uint, +}; +static unsigned int page_reporting_flush; +module_param_cb(flush, &flush_ops, &page_reporting_flush, 0200); +MODULE_PARM_DESC(flush, "Report at least N pages at page_reporting_order, or until all reported"); + int page_reporting_register(struct page_reporting_dev_info *prdev) { int err = 0; -- MST