[PATCH v5 14/36] mm/damon: skip private node memory in DAMON migration and pageout
Gregory Price <[email protected]> Mon, 20 Jul 2026 15:34:08 -0400
| Newsgroups | org.kernel.vger.linux-debuggers,dev.linux.lists.damon,dev.linux.lists.driver-core,dev.linux.lists.nvdimm,org.kernel.vger.cgroups,org.kernel.vger.kvm,org.kernel.vger.linux-cxl,org.kernel.vger.linux-doc,org.kernel.vger.linux-fsdevel,org.kernel.vger.linux-kernel,org.kernel.vger.linux-kselftest,org.kvack.linux-mm |
|---|---|
| Message-ID | <[email protected]> |
DAMON operates on physical address ranges, which can cover private node memory. Skip private-node folios in both DAMON's migration and reclaim paths. Signed-off-by: Gregory Price <[email protected]> --- mm/damon/paddr.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c index e4f98d67461f5..c741a94319750 100644 --- a/mm/damon/paddr.c +++ b/mm/damon/paddr.c @@ -12,6 +12,7 @@ #include <linux/swap.h> #include <linux/memory-tiers.h> #include <linux/mm_inline.h> +#include <linux/node_private.h> #include "../internal.h" #include "ops-common.h" @@ -250,6 +251,10 @@ static unsigned long damon_pa_pageout(struct damon_region *r, continue; } + /* private node memory is not reclaimable by default */ + if (folio_is_private_node(folio)) + goto put_folio; + if (damos_pa_filter_out(s, folio)) goto put_folio; else @@ -344,6 +349,10 @@ static unsigned long damon_pa_migrate(struct damon_region *r, else *sz_filter_passed += folio_size(folio) / addr_unit; + /* private nodes do not support migration by default */ + if (folio_is_private_node(folio)) + goto put_folio; + if (!folio_isolate_lru(folio)) goto put_folio; list_add(&folio->lru, &folio_list); -- 2.53.0-Meta