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[80.230.25.21]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-488ffc558f2sm265846935e9.1.2026.04.21.15.01.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Apr 2026 15:01:58 -0700 (PDT) Date: Tue, 21 Apr 2026 18:01:56 -0400 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: Andrew Morton , David Hildenbrand , Vlastimil Babka , Brendan Jackman , Michal Hocko , Suren Baghdasaryan , Jason Wang , Andrea Arcangeli , Gregory Price , linux-mm@kvack.org, virtualization@lists.linux.dev, Johannes Weiner , Zi Yan Subject: [PATCH RFC v3 14/19] mm: page_reporting: add flush parameter with page budget Message-ID: 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: i6RxeObmZ9WrACY0OZY1cMa-zs6GRzmLAROsb8_vdYo_1776808920 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 6D8A020013 X-Stat-Signature: aaw16porzp1owft46ezsmsqwb4f69tfm X-Rspam-User: X-HE-Tag: 1776808923-637603 X-HE-Meta: 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 WwYOOMzK nMp8nbhzcLAZnzbz1h3emyke3inIudwujmiOuo0QwiFXFYA2f5GP6UEplSvaXBb393Yri7vqNvDNQiHh53uk0DSWYAe6Kx5exGBXh9Ra4chS60xQT1DLyESFfwJf0qiiLx7PMKhZBCWplvljnq9r11OivXEpm5cLOb2UQK9BkdmCQVIUCwJYNj33vBJQIQC/D2HLDprAWXmovwpUfA4Vieob91k7BVfEYpdHOylEKcrnUvw8ZYWzK8wvBsR7eO01FtNtnwFb/6lN4e2Yw9gzlKV8Rh61FE+tdeH3XW2lIpSuAmC7HQgQwtiXvMjh7KWTyhtB4Ce40AIPpx4PpzqljhNI/iDF8MFylCOuQjz/GvprqA+5QW+TnzesU3nzkRtqvhXg2AII0TNSjLHk8VKs4+TH89A== 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 approximately how many pages (at page_reporting_order) to report. The flush loops through reporting cycles, each processing up to PAGE_REPORTING_CAPACITY pages, until the budget is exhausted, all pages are reported, or a signal is pending. 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 --- mm/page_reporting.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/mm/page_reporting.c b/mm/page_reporting.c index 6177d2413743..c09a8ac754dc 100644 --- a/mm/page_reporting.c +++ b/mm/page_reporting.c @@ -354,6 +354,48 @@ 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 += PAGE_REPORTING_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 up to N pages at page_reporting_order"); + int page_reporting_register(struct page_reporting_dev_info *prdev) { int err = 0; -- MST