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a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784034350; bh=s5H03+CpfRIUyjXLbOlyOr5XkjFBA2v9Q+EuJBH0CT8=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=gIvkcNKGPYOQyg0OoD2EcOKk6jp3QCaEszxn/eNJkK3mNudKcg/pidi834G2XiUhf LqcEJL5Rslc+z1j38FLMnR7WMUHvHlpnnie3RSHtwiXdylxDT24D/IDesR+4SrwZlc oKwwNKJp+/E0LX71X5TdNHw7sogC18f8/N1mXjWrrYNRqwmlsOTKIVELQW7HCWPO0k BB7IuhXe8LPagBA5crVQEsT5n1EAu9ASwq3xtpSwRb8qLOpRjjj2LM45l3wjX0zuiS pwg4tg2Yx7bamy9RkUEGbMcP4cea4OvI78w5EA0IDIMSxRknaOkIguhF1b9Tfse9pO TayF4gJAajBIg== Message-ID: <9e0db1c2-06ca-4dba-8fb1-552fab91cb02@kernel.org> Date: Tue, 14 Jul 2026 15:05:45 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 2/9] mm/page_owner: add MR_NEVER to enum migrate_reason and use it for last_migrate_reason To: Ye Liu , Andrew Morton , Steven Rostedt , Masami Hiramatsu , Vlastimil Babka , Jan Kiszka , Kieran Bingham Cc: Zi Yan , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Mathieu Desnoyers , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org References: <20260714015117.78351-1-ye.liu@linux.dev> <20260714015117.78351-3-ye.liu@linux.dev> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 5F921100006 X-Rspam-User: X-Stat-Signature: 4rqksn8neao4aummj99h8qpzhx8pbco5 X-Rspamd-Server: rspam03 X-HE-Tag: 1784034351-908488 X-HE-Meta: U2FsdGVkX18jqRLTP3KGDit1fI45bfc6qbt86jeMNs8/yMqkfSm5iuTRcHn9ppFs34F0XxQOuXd0DqfppQtLLYm1OmDrc4dn+NKW9BzO5ykl3BBNKQZj2Da1r1CbL2nsAYWqI9mR3TMLqMxYYTMB3B7wfeGb7qTftA6jbPmVBlwn1I0p+k9VxdYIwseolIC2afTSpC4YO7Cscrd5p+W3brU87nw3/1Vx2Qtjw30xnBD2AXkjDpHDJswZ3NEUve4S1XrZAxVwJ+oO8P3/PCNunjjYwdaCXwBB+UdCrHgTTBs1Bul+dzFE/IBQIhCv13Ar3Xkk+AxXoTTjwsdpwPL6TnQGV5nPTxMeAUpckzR4ut1l2NNzj9rbwhqf3OtNEw2SgTQbbygWoUD1wKCOymaIkrhLfUwKj4K/rySjVz7KxHKjQHLMyPLnmvYS49do0Fq77rQy1E1KbWr1kpQ8ytwcfx9Oa2tpGndUqNSL1r3MRnvm/8WLnhqsz70z1LjVydzNJDZmAJqu6+dQWKK+DEDi23Inr27SlUnndA1OEu8JhtT4pXShg16RmxHY6JXohfXnBEUHI6gccn7EXs4bJViv93QPNGVE27dlw8U1o8BboSKHKPhhTSIFPsGWIkHMdtWjoul4rNT2v4pzAcpUfTLcbvVgzPmS6YcpqFZZfyAEVDMHxAsu2B+L3nNCEbEwN39AAOUvdJQhgEP11rHPndbqWNmwHyAOxpR6liB5pUwpiPb/Slx/3qeZDfYWpMFTyLdnRQaaGBZWA0dAw+mn0DqcCp613kqtBE6TED6SiC1/FwrlrTsyN8VzM0EVSiO2/UWoki7s7NZZ3O1wwpKGIiPukzM2leIx+qV0JMHJQsELFnKZDSWQ6RFufU/9VNv2/lH79i0HhfN8wZ7CdGsB4oHAg7jSGSeTtrF5kmX3HzUCgVoMDqawzZQZfbr8NqEH4qUKUM6eG/FzC+ZowYHcKLS cXoHrx2Y livi9KvyuAULCH1N31MkY3V9ZB3IiAy8jjX06QM9S24pZQDRb41ppOQH/+7IND5BGErkKUy+DdRVN4yyzU48Ug6aYyI5UcmUn1DCrnhaxnJwFPNoiGok9vtMhmFU1G2Ibu9GyxBBXHJgolBZjokprAtnzVJpMZCBCOfBU2KPzl0SBMC+c3g4mQ1UMT0ts0DIAK6WW1HZgkBlzuO9cFHcqhoHlrUir3yZ2hOTJ8jrXznaDcoHoxwuXnKMlXD0618hbweFZ8TusWTZ3epjq+ClWyXtbsrG/cm9hxMBxnLuwam2/0ezvcBjbj4+V2Udq8QntIy2FBROnpoy8+nsh0Gz2NqnF9bTJHPnH49iNSkAFebnc9L/HwD/SBu4kUb/d1+v+fHhb2L2BmNmUp64oPEXJTlS90l4jUZExNosns8ehnJxglgs= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7/14/26 03:51, Ye Liu wrote: > The last_migrate_reason field uses -1 as a sentinel value to mean "no > migration has happened". Replace the four bare -1 occurrences by > adding a proper MR_NEVER member to enum migrate_reason, defining a > corresponding "never_migrated" string in the MIGRATE_REASON trace > macro, and updating the GDB page_owner script to use MR_NEVER instead > of the hardcoded -1 so that lx-dump-page-owner does not incorrectly > report unmigrated pages as migrated. > > No functional change. > > Signed-off-by: Ye Liu > Reviewed-by: Zi Yan > Reviewed-by: Vlastimil Babka (SUSE) > --- > include/linux/migrate_mode.h | 1 + > include/trace/events/migrate.h | 3 ++- > mm/page_owner.c | 8 ++++---- > scripts/gdb/linux/page_owner.py | 4 +++- > 4 files changed, 10 insertions(+), 6 deletions(-) > > diff --git a/include/linux/migrate_mode.h b/include/linux/migrate_mode.h > index 265c4328b36a..05102d4d2490 100644 > --- a/include/linux/migrate_mode.h > +++ b/include/linux/migrate_mode.h > @@ -25,6 +25,7 @@ enum migrate_reason { > MR_LONGTERM_PIN, > MR_DEMOTION, > MR_DAMON, > + MR_NEVER, /* page has never been migrated */ Shouldn't this be more like "MR_NONE" ? As "never" is not really a "reason" ? -- Cheers, David