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 6KGYO7ir 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2026-04-10 at 13:23 +1000, John Hubbard wrote... > Hi, > > This adds a bounded sleep to migration so that FOLL_LONGTERM pinning can > wait for transient folio references to drain, instead of failing after a > fixed number of retries. The wait uses a one-second timeout. An > alternative approach would be to call wait_var_event_killable() with no > timeout, but that doesn't match as well with migration's "this will > probably work" API. In other words, a short sleeping wait is more > appropriate here. This is much better than retrying $RANDOM times. It also seems it would provide a nice definition of what a transient vs. longterm pin is. Any pins longer than the migration timeout would be longterm. > When migrating pages for FOLL_LONGTERM pinning, migration can fail with > -EAGAIN if a folio has unexpected references. These references are often > transient, but the current retry loop gives up too quickly. This series > adds wait_var_event_timeout() at the retry points, paired with > wake_up_var() in folio_put() to wake the sleeper as soon as the refcount > drops. Nothing wrong with the above, just a minor nit that I wanted to check my understanding of. FOLL_LONGTERM causing migration implies this is in ZONE_MOVABLE, and the aim of ZONE_MOVABLE is that memory is always movable. That implies any unexpected page references should *always* be transient, not often transient. At least that's my understanding assuming drivers are behaving. > The wake_up_var() calls in folio_put() are gated behind a static key, > disabled by default, so non-migration workloads pay zero cost. > migrate_pages() enables the key on entry when the reason is > MR_LONGTERM_PIN, and disables it on exit. > > Toggling the key is not free. folio_put() is static inline, so every > compilation unit that calls it gets its own patch site (roughly 500 in > vmlinux, plus modules). On x86, jump label patching is batched (256 > sites per batch, 3 IPI rounds per batch), so enabling the key costs > 6-9 IPI broadcasts, a few hundred microseconds on a large machine. > That cost is paid twice per migrate_pages() call. Migration itself > spends several milliseconds per batch on LRU isolation, TLB flushes, > and page copies. Concurrent longterm-pin migrations after the first > just do an atomic_inc (no patching). > > Matthew Brost offered to performance-test this series [1], as Intel has > tests that stress migration and good metrics to catch regressions. > > [1] https://lore.kernel.org/all/aX+oUorOWPt1xbgw@lstrano-desk.jf.intel.com/ > > John Hubbard (2): > mm: wake up folio refcount waiters on folio_put() > mm/migrate: wait for folio refcount during longterm pin migration > > include/linux/mm.h | 8 ++++++++ > mm/migrate.c | 30 ++++++++++++++++++++++++++++++ > mm/swap.c | 10 +++++++++- > 3 files changed, 47 insertions(+), 1 deletion(-) > > > base-commit: 9a9c8ce300cd3859cc87b408ef552cd697cc2ab7 > -- > 2.53.0 >