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b=BCVvSJdVnbUQEK77KUzBs/Bk2LG9oTBGvBRgRHfTrvgrnx2HJbuZU0F6/ecmMh3qN GArXeBh3QnH2IRie6698xUPhpXwnT5Wmw6vu0qrBvA0HP9P0acjTvCwqUkfY0VfQsd 8qEsHGHpinbA2essXEKq51osF507kZmLvbHxMCh9Z31YST6OMTGtyo87ydZcpIcgX6 pnxw7kAtkEK7eeT2uoXhC2f0U+/FyPvdxy4u9eKSm0VnPaBEJuEiWYpowGxfnoJNsf T+r9wLz138TXlZf85JV97U8TSEdsRkple3QL3Y/AKW78kIuDjLtimQ0p5QDhg5jDWV TUOA7g75W9oJQ== From: SJ Park To: pratmal@google.com Cc: SJ Park , akpm@linux-foundation.org, vbabka@kernel.org, david@kernel.org, corbet@lwn.net, ljs@kernel.org, skhan@linuxfoundation.org, anshuman.khandual@arm.com, gthelen@google.com, surenb@google.com, mhocko@suse.com, jackmanb@google.com, hannes@cmpxchg.org, ziy@nvidia.com, liam@infradead.org, rppt@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Brendan Jackman Subject: Re: [PATCH v4] mm/page_reporting: Add page_reporting_delay_ms module parameter Date: Fri, 31 Jul 2026 17:02:53 -0700 Message-ID: <20260801000254.77032-1-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260731193705.2902728-1-pratmal@google.com> References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: D8A7BC000D X-Stat-Signature: 8b1knj6ggpyg5ca7yqukhats41oo199s X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1785542584-718253 X-HE-Meta: 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 2TTkhf1+ 4ma02nAVlQjCRu85udrr9+q7sfSP7ircolgPfgi8W9z3vKCKfbykudtgQfP4O6zc5w0dOprhku3TzH5Uep0NNxy78gCQrcOr+I2hFPFKQGwbr+OLlTENa/FLgTo1VzcyiLIse5JrGEz9J63cjWIpcNHf94rWGM8V1cOr4GpPhrHSqiUGwZBH40LZNM/OMzHjAbI5ctbMI5vnMjWfDcdGO9QdvqSQPduHIzJcPI060oStA8z0hKxMk10c2pjwtGqI2EPJGu8pZNBsu2BRynh2HSuK8cR185tPaBVsbNqV0drxtM4mccJL3r+7h5Q== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Brendan changed his mail address [1]. I added him to the recipient list. On Fri, 31 Jul 2026 19:37:05 +0000 pratmal@google.com wrote: > From: Pratyush Mallick > > 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. Looks good and making sense to me. > > Signed-off-by: Pratyush Mallick Reviewed-by: SJ Park [1] https://lore.kernel.org/20260729-email-change-v1-1-666ae7c2b7fc@google.com Thanks, SJ [...]