linux-kernel - Re: [PATCH 4/4] mm: delay page_remove_rmap() until after the TLB has been flushed

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Message-ID: <Y2vM6FFQX5GlOyBs@cmpxchg.org>
Date:   Wed, 9 Nov 2022 10:53:12 -0500
From:   Johannes Weiner <hannes@...xchg.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Hugh Dickins <hughd@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Nadav Amit <nadav.amit@...il.com>,
        Will Deacon <will@...nel.org>,
        Aneesh Kumar <aneesh.kumar@...ux.ibm.com>,
        Nick Piggin <npiggin@...il.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Gerald Schaefer <gerald.schaefer@...ux.ibm.com>
Subject: Re: [PATCH 4/4] mm: delay page_remove_rmap() until after the TLB has
 been flushed

All 4 patches look good to me from an MM and cgroup point of view.

And with the pte still locked over rmap, we can continue with the
removal of the cgroup-specific locking and rely on native MM
synchronization, which is great as well.

Thanks,
Johannes