From nobody Mon Feb 9 20:55:13 2026 Received: from invmail4.hynix.com (exvmail4.hynix.com [166.125.252.92]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 02C1A6ADE for ; Thu, 11 Jan 2024 06:23:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sk.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sk.com X-AuditID: a67dfc5b-d6dff70000001748-ed-659f85c894c4 From: Byungchul Park To: linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: kernel_team@skhynix.com, akpm@linux-foundation.org, ying.huang@intel.com, namit@vmware.com, xhao@linux.alibaba.com, mgorman@techsingularity.net, hughd@google.com, willy@infradead.org, david@redhat.com, peterz@infradead.org, luto@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com Subject: [v5 4/7] mm: Separate move/undo doing on folio list from migrate_pages_batch() Date: Thu, 11 Jan 2024 15:07:54 +0900 Message-Id: <20240111060757.13563-5-byungchul@sk.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20240111060757.13563-1-byungchul@sk.com> References: <20240111060757.13563-1-byungchul@sk.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrMLMWRmVeSWpSXmKPExsXC9ZZnke6J1vmpBou/CFjMWb+GzeLzhn9s Fi82tDNafF3/i9ni6ac+FovLu+awWdxb85/V4vyutawWO5buY7K4dGABk8X1XQ8ZLY73HmCy 2LxpKrPF7x9AdXOmWFmcnDWZxUHA43trH4vHgk2lHptXaHks3vOSyWPTqk42j02fJrF7vDt3 jt3jxIzfLB47H1p6zDsZ6PF+31U2j62/7Dw+b5LzeDf/LVsAXxSXTUpqTmZZapG+XQJXxo33 d9kL+nUqFs15yN7AuFK5i5GDQ0LAROLwXK8uRk4wc9WkPawgNpuAusSNGz+ZQWwRATOJg61/ 2LsYuTiYBR4wScx9u4IRJCEsEC7ReHEymM0ioCqxbvp8dhCbV8BU4uqCZiaIofISqzccABvE CTTowuFZjCB7hYBqHrXVgcyUEPjOJrFg3Tk2iHpJiYMrbrBMYORdwMiwilEoM68sNzEzx0Qv ozIvs0IvOT93EyMw6JfV/onewfjpQvAhRgEORiUe3geL5qUKsSaWFVfmHmKU4GBWEuFV+Dwn VYg3JbGyKrUoP76oNCe1+BCjNAeLkjiv0bfyFCGB9MSS1OzU1ILUIpgsEwenVANj8Pz/p6Pz Yr4XLF9uytDucVlF2ofLR2DHs827TB2a2y5d+9Uwdf5CNQ6GVRM1NjzR0KvkUb4p+umkynle hyXCr4/yn+M+mvVETet83P6eptNF82MnndijE1cx4an1U4+T8ye0KB4+MrdlMw+7U/cLj/vv hQ99z5V0Xfh2Nc/MOMXLmrFXMr63KrEUZyQaajEXFScCAJniNQJ2AgAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrNLMWRmVeSWpSXmKPExsXC5WfdrHuidX6qwdqrrBZz1q9hs/i84R+b xYsN7YwWX9f/YrZ4+qmPxeLw3JOsFpd3zWGzuLfmP6vF+V1rWS12LN3HZHHpwAImi+u7HjJa HO89wGSxedNUZovfP4Dq5kyxsjg5azKLg6DH99Y+Fo8Fm0o9Nq/Q8li85yWTx6ZVnWwemz5N Yvd4d+4cu8eJGb9ZPHY+tPSYdzLQ4/2+q2wei198YPLY+svO4/MmOY9389+yBfBHcdmkpOZk lqUW6dslcGXceH+XvaBfp2LRnIfsDYwrlbsYOTkkBEwkVk3awwpiswmoS9y48ZMZxBYRMJM4 2PqHvYuRi4NZ4AGTxNy3KxhBEsIC4RKNFyeD2SwCqhLrps9nB7F5BUwlri5oZoIYKi+xesMB sEGcQIMuHJ4FVM/BIQRU86itbgIj1wJGhlWMIpl5ZbmJmTmmesXZGZV5mRV6yfm5mxiBQbys 9s/EHYxfLrsfYhTgYFTi4TV4OS9ViDWxrLgy9xCjBAezkgivwuc5qUK8KYmVValF+fFFpTmp xYcYpTlYlMR5vcJTE4QE0hNLUrNTUwtSi2CyTBycUg2M8zb8P3GI4dD5fyp7tjzven33zOGC MNOZ3Sy+HKaPF+z/tVomrDJccdruk9Jsh040fpl/OUni5UT52En2k76L3FrUK/y79/TbtBWW Kg8sfk+eMFv1f2z0aVcF07A4YbYZtkf0U57mzirk+vXO6erlLS8vbvPpmca+a+NcxZJN2Ykd l317d9lzRSixFGckGmoxFxUnAgA/JYEJXgIAAA== X-CFilter-Loop: Reflected Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Functionally, no change. This is a preparation for migrc mechanism that requires to use separate folio lists for its own handling at migration. Refactored migrate_pages_batch() and separated move and undo parts operating on folio list, from migrate_pages_batch(). Signed-off-by: Byungchul Park --- mm/migrate.c | 134 +++++++++++++++++++++++++++++++-------------------- 1 file changed, 83 insertions(+), 51 deletions(-) diff --git a/mm/migrate.c b/mm/migrate.c index 397f2a6e34cb..bbe1ecef4956 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1611,6 +1611,81 @@ static int migrate_hugetlbs(struct list_head *from, = new_folio_t get_new_folio, return nr_failed; } =20 +static void migrate_folios_move(struct list_head *src_folios, + struct list_head *dst_folios, + free_folio_t put_new_folio, unsigned long private, + enum migrate_mode mode, int reason, + struct list_head *ret_folios, + struct migrate_pages_stats *stats, + int *retry, int *thp_retry, int *nr_failed, + int *nr_retry_pages) +{ + struct folio *folio, *folio2, *dst, *dst2; + bool is_thp; + int nr_pages; + int rc; + + dst =3D list_first_entry(dst_folios, struct folio, lru); + dst2 =3D list_next_entry(dst, lru); + list_for_each_entry_safe(folio, folio2, src_folios, lru) { + is_thp =3D folio_test_large(folio) && folio_test_pmd_mappable(folio); + nr_pages =3D folio_nr_pages(folio); + + cond_resched(); + + rc =3D migrate_folio_move(put_new_folio, private, + folio, dst, mode, + reason, ret_folios); + /* + * The rules are: + * Success: folio will be freed + * -EAGAIN: stay on the unmap_folios list + * Other errno: put on ret_folios list + */ + switch(rc) { + case -EAGAIN: + *retry +=3D 1; + *thp_retry +=3D is_thp; + *nr_retry_pages +=3D nr_pages; + break; + case MIGRATEPAGE_SUCCESS: + stats->nr_succeeded +=3D nr_pages; + stats->nr_thp_succeeded +=3D is_thp; + break; + default: + *nr_failed +=3D 1; + stats->nr_thp_failed +=3D is_thp; + stats->nr_failed_pages +=3D nr_pages; + break; + } + dst =3D dst2; + dst2 =3D list_next_entry(dst, lru); + } +} + +static void migrate_folios_undo(struct list_head *src_folios, + struct list_head *dst_folios, + free_folio_t put_new_folio, unsigned long private, + struct list_head *ret_folios) +{ + struct folio *folio, *folio2, *dst, *dst2; + + dst =3D list_first_entry(dst_folios, struct folio, lru); + dst2 =3D list_next_entry(dst, lru); + list_for_each_entry_safe(folio, folio2, src_folios, lru) { + int old_page_state =3D 0; + struct anon_vma *anon_vma =3D NULL; + + __migrate_folio_extract(dst, &old_page_state, &anon_vma); + migrate_folio_undo_src(folio, old_page_state & PAGE_WAS_MAPPED, + anon_vma, true, ret_folios); + list_del(&dst->lru); + migrate_folio_undo_dst(dst, true, put_new_folio, private); + dst =3D dst2; + dst2 =3D list_next_entry(dst, lru); + } +} + /* * migrate_pages_batch() first unmaps folios in the from list as many as * possible, then move the unmapped folios. @@ -1633,7 +1708,7 @@ static int migrate_pages_batch(struct list_head *from, int pass =3D 0; bool is_thp =3D false; bool is_large =3D false; - struct folio *folio, *folio2, *dst =3D NULL, *dst2; + struct folio *folio, *folio2, *dst =3D NULL; int rc, rc_saved =3D 0, nr_pages; LIST_HEAD(unmap_folios); LIST_HEAD(dst_folios); @@ -1769,42 +1844,11 @@ static int migrate_pages_batch(struct list_head *fr= om, thp_retry =3D 0; nr_retry_pages =3D 0; =20 - dst =3D list_first_entry(&dst_folios, struct folio, lru); - dst2 =3D list_next_entry(dst, lru); - list_for_each_entry_safe(folio, folio2, &unmap_folios, lru) { - is_thp =3D folio_test_large(folio) && folio_test_pmd_mappable(folio); - nr_pages =3D folio_nr_pages(folio); - - cond_resched(); - - rc =3D migrate_folio_move(put_new_folio, private, - folio, dst, mode, - reason, ret_folios); - /* - * The rules are: - * Success: folio will be freed - * -EAGAIN: stay on the unmap_folios list - * Other errno: put on ret_folios list - */ - switch(rc) { - case -EAGAIN: - retry++; - thp_retry +=3D is_thp; - nr_retry_pages +=3D nr_pages; - break; - case MIGRATEPAGE_SUCCESS: - stats->nr_succeeded +=3D nr_pages; - stats->nr_thp_succeeded +=3D is_thp; - break; - default: - nr_failed++; - stats->nr_thp_failed +=3D is_thp; - stats->nr_failed_pages +=3D nr_pages; - break; - } - dst =3D dst2; - dst2 =3D list_next_entry(dst, lru); - } + /* Move the unmapped folios */ + migrate_folios_move(&unmap_folios, &dst_folios, + put_new_folio, private, mode, reason, + ret_folios, stats, &retry, &thp_retry, + &nr_failed, &nr_retry_pages); } nr_failed +=3D retry; stats->nr_thp_failed +=3D thp_retry; @@ -1813,20 +1857,8 @@ static int migrate_pages_batch(struct list_head *fro= m, rc =3D rc_saved ? : nr_failed; out: /* Cleanup remaining folios */ - dst =3D list_first_entry(&dst_folios, struct folio, lru); - dst2 =3D list_next_entry(dst, lru); - list_for_each_entry_safe(folio, folio2, &unmap_folios, lru) { - int old_page_state =3D 0; - struct anon_vma *anon_vma =3D NULL; - - __migrate_folio_extract(dst, &old_page_state, &anon_vma); - migrate_folio_undo_src(folio, old_page_state & PAGE_WAS_MAPPED, - anon_vma, true, ret_folios); - list_del(&dst->lru); - migrate_folio_undo_dst(dst, true, put_new_folio, private); - dst =3D dst2; - dst2 =3D list_next_entry(dst, lru); - } + migrate_folios_undo(&unmap_folios, &dst_folios, + put_new_folio, private, ret_folios); =20 return rc; } --=20 2.17.1