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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On 10/20/26 5:50 AM, Gregory Price (Meta) wrote: > user_proactive_reclaim() limits per-node reclaim to > gfp_zone(GFP_KERNEL), which is ZONE_NORMAL. Proactive reclaim serves no > allocation, but that limit makes shrink_node() skip every ZONE_MOVABLE > folio, so writing to /sys/devices/system/node/nodeN/reclaim never > reclaims a node's movable memory. A movable-only node, such as dax/kmem > or hotplugged memory onlined movable, reclaims nothing and fails with > -EAGAIN. > > To reproduce, fill a movable-only node with clean page cache and write > 200M to its nodeN/reclaim: the write fails with -EAGAIN and the page > cache stays. The same write to a ZONE_NORMAL node frees 200MB. > > Scan every zone, as memory.reclaim does. > > Fixes: b980077899ea4 ("mm: introduce per-node proactive reclaim interface") > Cc: stable@vger.kernel.org > Signed-off-by: Gregory Price (Meta) > --- > mm/vmscan.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/mm/vmscan.c b/mm/vmscan.c > index e82ba737c028d..90f7a7bf4e426 100644 > --- a/mm/vmscan.c > +++ b/mm/vmscan.c > @@ -8180,7 +8180,7 @@ int user_proactive_reclaim(char *buf, > } else { > struct scan_control sc = { > .gfp_mask = current_gfp_context(gfp_mask), > - .reclaim_idx = gfp_zone(gfp_mask), > + .reclaim_idx = MAX_NR_ZONES - 1, > .proactive_swappiness = swappiness == -1 ? NULL : &swappiness, > .priority = DEF_PRIORITY, > .may_writepage = 1, I just noticed some other issues with this code, in terms of honouring zone_reclaim_node (not related to this patch). I'll send out fixes, for this patch. Reviewed-by: Balbir Singh