From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4971C2264C7 for ; Tue, 25 Aug 2026 01:53:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787622808; cv=none; b=U+QmmwvKBMEx1mGdwiyb6iECcnb0Pxf+aomVEQj4dobmkrrdjis0t/PPLB9+JocOo9wWnpwaFRWUm5X/yByQXTDCf645u9WYCE71ShSu4bec5w7E+nFZutiQToJRjtR+LsX55z6vIeJWqPJOJOp7AIXjp81tVpzkzbbf9wyQkAM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787622808; c=relaxed/simple; bh=bZe7goO7wLLLsDc1JwFLN8340fuCUTCoTLhMiJo3Zg4=; h=Date:To:From:Subject:Message-Id; b=ZjPm6WgDSfR3Yj4GGWbyetLibWzsmX5DZB73vuTnqivVSpRZbKdT6oNDbhBCp8lGJSQmAeNCAv4EZzQNDrpB+8fKzVtClmx8W4ddy+5i22uU5QIcjbD2jShofZFX6Qg0uHX99jkLknZbIT5b/bnkgs70Hb/RBOiS3IgY0UtdK4o= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=qH+e6tMU; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="qH+e6tMU" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CD8981F00A3D; Tue, 25 Aug 2026 01:53:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1787622806; bh=brFQWxYA06hqEAFRbwyW4ZWLkZomYDIiNW9BAU/OrpM=; h=Date:To:From:Subject; b=qH+e6tMUUOBdB/1wIL5L9jGX55omLZDbRaH6ATnZ05wdp7+KLh0amNIn4gIWVMzG/ qp2655vM0P2+IWN1fHJfdueex2A6tSBPcW89/K7aX6ldoTSEaUtPeJn84UXGNcHali +GIuIm9ZlgvLlNpx5iFu+AtYhkbzl1x3dukwO2MM= Date: Mon, 24 Aug 2026 18:53:26 -0700 To: mm-commits@vger.kernel.org,ziy@nvidia.com,vbabka@kernel.org,surenb@google.com,sj@kernel.org,rppt@kernel.org,mhocko@suse.com,ljs@kernel.org,liam@infradead.org,jackmanb@google.com,hannes@cmpxchg.org,gthelen@google.com,david@kernel.org,corbet@lwn.net,anshuman.khandual@arm.com,pratmal@google.com,akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-stable] mm-page_reporting-add-page_reporting_delay_ms-module-parameter.patch removed from -mm tree Message-Id: <20260825015326.CD8981F00A3D@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: mm/page_reporting: add page_reporting_delay_ms module parameter has been removed from the -mm tree. Its filename was mm-page_reporting-add-page_reporting_delay_ms-module-parameter.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: Pratyush Mallick Subject: mm/page_reporting: add page_reporting_delay_ms module parameter Date: Fri, 31 Jul 2026 19:37:05 +0000 Free page reporting currently hardcodes a 2-second interval between reports. This rigid delay cannot accommodate diverse guest workloads. This patch introduces a module parameter, page_reporting_delay_ms (default: 2000), allowing users to tune the reporting rate: - Lower values enable aggressive memory reclamation by returning unused pages to the host immediately. - Higher values help batch pages during spiky allocation/free churn, reducing hypercalls and nested page fault overheads. Setting the delay to 0 is safe and execution is strictly gated by: - reporting is only triggered by high-order page frees. - expensive hypercalls are bounded by a slot capacity watermark check before proceeding. Link: https://lore.kernel.org/20260731193705.2902728-1-pratmal@google.com Signed-off-by: Pratyush Mallick Reviewed-by: SJ Park Acked-by: Lorenzo Stoakes (ARM) Acked-by: David Hildenbrand (Arm) Cc: Anshuman Khandual Cc: Brendan Jackman Cc: Greg Thelen Cc: Johannes Weiner Cc: Jonathan Corbet Cc: Liam R. Howlett Cc: Michal Hocko Cc: Mike Rapoport Cc: SeongJae Park Cc: Suren Baghdasaryan Cc: Vlastimil Babka Cc: Zi Yan Signed-off-by: Andrew Morton --- Documentation/admin-guide/kernel-parameters.txt | 6 +++ mm/page_reporting.c | 28 +++++++++----- 2 files changed, 24 insertions(+), 10 deletions(-) --- a/Documentation/admin-guide/kernel-parameters.txt~mm-page_reporting-add-page_reporting_delay_ms-module-parameter +++ a/Documentation/admin-guide/kernel-parameters.txt @@ -4810,6 +4810,12 @@ Kernel parameters Adjust the minimal page reporting order. The page reporting is disabled when it exceeds MAX_PAGE_ORDER. + page_reporting.page_reporting_delay_ms= + [KNL] Free page reporting delay in milliseconds + Format: + Adjust the delay in milliseconds between free page + reporting intervals. Default is 2000 (2 seconds). + panic= [KNL] Kernel behaviour on panic: delay timeout > 0: seconds before rebooting timeout = 0: wait forever --- a/mm/page_reporting.c~mm-page_reporting-add-page_reporting_delay_ms-module-parameter +++ a/mm/page_reporting.c @@ -48,7 +48,11 @@ MODULE_PARM_DESC(page_reporting_order, " */ EXPORT_SYMBOL_GPL(page_reporting_order); -#define PAGE_REPORTING_DELAY (2 * HZ) +static unsigned int page_reporting_delay_ms = 2 * MSEC_PER_SEC; +module_param(page_reporting_delay_ms, uint, 0644); +MODULE_PARM_DESC(page_reporting_delay_ms, + "Set page reporting delay in milliseconds"); + static struct page_reporting_dev_info __rcu *pr_dev_info __read_mostly; enum { @@ -57,6 +61,13 @@ enum { PAGE_REPORTING_ACTIVE }; +/* schedule work for page reporting */ +static void page_reporting_schedule_work(struct page_reporting_dev_info *prdev) +{ + queue_delayed_work(system_freezable_wq, &prdev->work, + msecs_to_jiffies(page_reporting_delay_ms)); +} + /* request page reporting */ static void __page_reporting_request(struct page_reporting_dev_info *prdev) @@ -77,12 +88,10 @@ __page_reporting_request(struct page_rep return; /* - * Delay the start of work to allow a sizable queue to build. For - * now we are limiting this to running no more than once every - * couple of seconds. + * Delay the start of work to allow a sizable queue to build. + * We limit this based on page_reporting_delay_ms. */ - queue_delayed_work(system_freezable_wq, &prdev->work, - PAGE_REPORTING_DELAY); + page_reporting_schedule_work(prdev); } /* notify prdev of free page reporting request */ @@ -337,13 +346,12 @@ static void page_reporting_process(struc err_out: /* * If the state has reverted back to requested then there may be - * additional pages to be processed. We will defer for 2s to allow - * more pages to accumulate. + * additional pages to be processed. We will defer by + * page_reporting_delay_ms to allow more pages to accumulate. */ state = atomic_cmpxchg(&prdev->state, state, PAGE_REPORTING_IDLE); if (state == PAGE_REPORTING_REQUESTED) - queue_delayed_work(system_freezable_wq, &prdev->work, - PAGE_REPORTING_DELAY); + page_reporting_schedule_work(prdev); } static DEFINE_MUTEX(page_reporting_mutex); _ Patches currently in -mm which might be from pratmal@google.com are