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Tue, 1 Jul 2025 13:20:14 +0000 Received: from DM4PR10MB8218.namprd10.prod.outlook.com ([fe80::2650:55cf:2816:5f2]) by DM4PR10MB8218.namprd10.prod.outlook.com ([fe80::2650:55cf:2816:5f2%6]) with mapi id 15.20.8880.027; Tue, 1 Jul 2025 13:20:14 +0000 Date: Tue, 1 Jul 2025 14:20:11 +0100 From: Lorenzo Stoakes To: David Hildenbrand Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-doc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, virtualization@lists.linux.dev, linux-fsdevel@vger.kernel.org, Andrew Morton , Jonathan Corbet , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Jerrin Shaji George , Arnd Bergmann , Greg Kroah-Hartman , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , Eugenio =?utf-8?B?UMOpcmV6?= , Alexander Viro , Christian Brauner , Jan Kara , Zi Yan , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , "Liam R. 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Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Jun 30, 2025 at 03:00:09PM +0200, David Hildenbrand wrote: > Let's bring the docs up-to-date. Setting PG_movable_ops + page->private > very likely still requires to be performed under documented locks: > it's complicated. > > We will rework this in the future, as we will try avoiding using the > page lock. > > Signed-off-by: David Hildenbrand LGTM, so: Reviewed-by: Lorenzo Stoakes > --- > include/linux/balloon_compaction.h | 13 ++++++------- > 1 file changed, 6 insertions(+), 7 deletions(-) > > diff --git a/include/linux/balloon_compaction.h b/include/linux/balloon_compaction.h > index b222b0737c466..2fecfead91d26 100644 > --- a/include/linux/balloon_compaction.h > +++ b/include/linux/balloon_compaction.h > @@ -4,12 +4,13 @@ > * > * Common interface definitions for making balloon pages movable by compaction. > * > - * Balloon page migration makes use of the general non-lru movable page > + * Balloon page migration makes use of the general "movable_ops page migration" > * feature. > * > * page->private is used to reference the responsible balloon device. > - * page->mapping is used in context of non-lru page migration to reference > - * the address space operations for page isolation/migration/compaction. > + * That these pages have movable_ops, and which movable_ops apply, > + * is derived from the page type (PageOffline()) combined with the > + * PG_movable_ops flag (PageMovableOps()). > * > * As the page isolation scanning step a compaction thread does is a lockless > * procedure (from a page standpoint), it might bring some racy situations while > @@ -17,12 +18,10 @@ > * and safely perform balloon's page compaction and migration we must, always, > * ensure following these simple rules: > * > - * i. when updating a balloon's page ->mapping element, strictly do it under > - * the following lock order, independently of the far superior > - * locking scheme (lru_lock, balloon_lock): > + * i. Setting the PG_movable_ops flag and page->private with the following > + * lock order > * +-page_lock(page); > * +--spin_lock_irq(&b_dev_info->pages_lock); > - * ... page->mapping updates here ... > * > * ii. isolation or dequeueing procedure must remove the page from balloon > * device page list under b_dev_info->pages_lock. > -- > 2.49.0 >