On 6/26/21 12:18 AM, Alexander Duyck wrote:
On Thu, Jun 24, 2021 at 7:20 PM Gavin Shan <gshan@xxxxxxxxxx> wrote:The page reporting threshold is currently equal to @pageblock_order, which is 13 and 512MB on arm64 with 64KB base page size selected. The page reporting won't be triggered if the freeing page can't come up with a free area like that huge. The condition is hard to be met, especially when the system memory becomes fragmented. This series intends to solve the issue by having page reporting threshold as 5 (2MB) on arm64 with 64KB base page size. The patches are organized as: PATCH[1/4] Fix some coding style in __page_reporting_request(). PATCH[2/4] Represents page reporting order with variable so that it can be exported as module parameter. PATCH[3/4] Allows the device driver (e.g. virtio_balloon) to specify the page reporting order when the device info is registered. PATCH[4/4] Specifies the page reporting order to 5, corresponding to 2MB in size on ARM64 when 64KB base page size is used. Changelog ========= v5: * Restore @page_reporting_order to @pageblock_order when device is registered in PATCH[2/4] to keep "git bisect" friendly at least. (Alex)These latest changes address the concerns I had.
Thanks again for your review, Alex. However, v4 was merged and it's fine since v5 only resolves 'git-bisect' friendly issue on PATCH[v4 2/4]. Thanks, Gavin
