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Thu, 03 Sep 2026 09:21:41 +0000 X-Mizu-Trace-ID: 997dcd35b942ce68 X-Migadu-Flow: FLOW_OUT From: Hongfu Li To: akpm@linux-foundation.org, vbabka@kernel.org, surenb@google.com, mhocko@suse.com, brendan.jackman@linux.dev, hannes@cmpxchg.org, ziy@nvidia.com Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, hongfu.li@linux.dev, Hongfu Li Subject: [PATCH] mm/page_owner: preserve original free_pid/free_tgid during folio migration Date: Thu, 3 Sep 2026 17:21:26 +0800 Message-ID: <20260903092126.24685-1-hongfu.li@linux.dev> X-Mailer: git-send-email 2.54.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: 89ncbtu7oii5cx6h6ptmmpz5o4cef13n X-Rspamd-Queue-Id: AC85614000E X-Rspamd-Server: rspam02 X-Rspam-User: X-HE-Tag: 1788427303-626539 X-HE-Meta: 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 NkX1XzQu s3vCMUZvi7mdsny8oSkZmmNeQXpG8ZHwYLlGXh6MNXw4x94XmLSKt1bLRxFgFpR54eJKEgWCrdObkMf1yGwCdHb/qiMYDqof8E1CFt4exWKihbQLnMgUsk8juckz+Pl+GOPbe1WnGcsfHADpczqEGL53WvN3WpTT8Uz0lGRKCt6j+0/fCHvM4yklm013OMnEPoFuAgCBtaLHtcPGo96UOJilo88rNnm8x+5yOJHiPHueCn2eOrz5IttEq9iCXSt9RKv0fadw09EJBr2N3LVUFe9EDxQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Hongfu Li __update_page_owner_free_handle() accepts pid and tgid, but ignores them, always storing current->pid and current->tgid. __folio_copy_owner() forwards the original free pid/tgid during folio migration, yet these values were overwritten by the migrating task. Store the passed-in pid/tgid so the migrated folio keeps the original free attribution. Signed-off-by: Hongfu Li --- mm/page_owner.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/page_owner.c b/mm/page_owner.c index 3fc37d9b908e..cfc31c92d765 100644 --- a/mm/page_owner.c +++ b/mm/page_owner.c @@ -307,8 +307,8 @@ static inline void __update_page_owner_free_handle(struct page *page, page_owner->free_handle = handle; } page_owner->free_ts_nsec = free_ts_nsec; - page_owner->free_pid = current->pid; - page_owner->free_tgid = current->tgid; + page_owner->free_pid = pid; + page_owner->free_tgid = tgid; } rcu_read_unlock(); } -- 2.54.0