lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list] 
Message-ID: <20240711072929.3590000-2-ryan.roberts@arm.com>
Date: Thu, 11 Jul 2024 08:29:24 +0100
From: Ryan Roberts <ryan.roberts@....com>
To: Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Jonathan Corbet <corbet@....net>,
	"Matthew Wilcox (Oracle)" <willy@...radead.org>,
	David Hildenbrand <david@...hat.com>,
	Barry Song <baohua@...nel.org>,
	Lance Yang <ioworker0@...il.com>,
	Baolin Wang <baolin.wang@...ux.alibaba.com>
Cc: Ryan Roberts <ryan.roberts@....com>,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [PATCH v1 1/2] mm: Cleanup count_mthp_stat() definition

Let's move count_mthp_stat() so that it's always defined, even when THP
is disabled. Previously uses of the function in files such as shmem.c,
which are compiled even when THP is disabled, required ugly THP
ifdeferry. With this cleanup, we can remove those ifdefs and the
function resolves to a nop when THP is disabled.

I shortly plan to call count_mthp_stat() from more THP-invariant source
files.

Signed-off-by: Ryan Roberts <ryan.roberts@....com>
---
 include/linux/huge_mm.h | 70 ++++++++++++++++++++---------------------
 mm/memory.c             |  2 --
 mm/shmem.c              |  6 ----
 3 files changed, 35 insertions(+), 43 deletions(-)

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index cff002be83eb..cb93b9009ce4 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -108,6 +108,41 @@ extern struct kobj_attribute thpsize_shmem_enabled_attr;
 #define HPAGE_PUD_MASK	(~(HPAGE_PUD_SIZE - 1))
 #define HPAGE_PUD_SIZE	((1UL) << HPAGE_PUD_SHIFT)
 
+enum mthp_stat_item {
+	MTHP_STAT_ANON_FAULT_ALLOC,
+	MTHP_STAT_ANON_FAULT_FALLBACK,
+	MTHP_STAT_ANON_FAULT_FALLBACK_CHARGE,
+	MTHP_STAT_SWPOUT,
+	MTHP_STAT_SWPOUT_FALLBACK,
+	MTHP_STAT_SHMEM_ALLOC,
+	MTHP_STAT_SHMEM_FALLBACK,
+	MTHP_STAT_SHMEM_FALLBACK_CHARGE,
+	MTHP_STAT_SPLIT,
+	MTHP_STAT_SPLIT_FAILED,
+	MTHP_STAT_SPLIT_DEFERRED,
+	__MTHP_STAT_COUNT
+};
+
+#if defined(CONFIG_TRANSPARENT_HUGEPAGE) && defined(CONFIG_SYSFS)
+struct mthp_stat {
+	unsigned long stats[ilog2(MAX_PTRS_PER_PTE) + 1][__MTHP_STAT_COUNT];
+};
+
+DECLARE_PER_CPU(struct mthp_stat, mthp_stats);
+
+static inline void count_mthp_stat(int order, enum mthp_stat_item item)
+{
+	if (order <= 0 || order > PMD_ORDER)
+		return;
+
+	this_cpu_inc(mthp_stats.stats[order][item]);
+}
+#else
+static inline void count_mthp_stat(int order, enum mthp_stat_item item)
+{
+}
+#endif
+
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 
 extern unsigned long transparent_hugepage_flags;
@@ -263,41 +298,6 @@ struct thpsize {
 
 #define to_thpsize(kobj) container_of(kobj, struct thpsize, kobj)
 
-enum mthp_stat_item {
-	MTHP_STAT_ANON_FAULT_ALLOC,
-	MTHP_STAT_ANON_FAULT_FALLBACK,
-	MTHP_STAT_ANON_FAULT_FALLBACK_CHARGE,
-	MTHP_STAT_SWPOUT,
-	MTHP_STAT_SWPOUT_FALLBACK,
-	MTHP_STAT_SHMEM_ALLOC,
-	MTHP_STAT_SHMEM_FALLBACK,
-	MTHP_STAT_SHMEM_FALLBACK_CHARGE,
-	MTHP_STAT_SPLIT,
-	MTHP_STAT_SPLIT_FAILED,
-	MTHP_STAT_SPLIT_DEFERRED,
-	__MTHP_STAT_COUNT
-};
-
-struct mthp_stat {
-	unsigned long stats[ilog2(MAX_PTRS_PER_PTE) + 1][__MTHP_STAT_COUNT];
-};
-
-#ifdef CONFIG_SYSFS
-DECLARE_PER_CPU(struct mthp_stat, mthp_stats);
-
-static inline void count_mthp_stat(int order, enum mthp_stat_item item)
-{
-	if (order <= 0 || order > PMD_ORDER)
-		return;
-
-	this_cpu_inc(mthp_stats.stats[order][item]);
-}
-#else
-static inline void count_mthp_stat(int order, enum mthp_stat_item item)
-{
-}
-#endif
-
 #define transparent_hugepage_use_zero_page()				\
 	(transparent_hugepage_flags &					\
 	 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
diff --git a/mm/memory.c b/mm/memory.c
index 802d0d8a40f9..a50fdefb8f0b 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4597,9 +4597,7 @@ static vm_fault_t do_anonymous_page(struct vm_fault *vmf)
 
 	folio_ref_add(folio, nr_pages - 1);
 	add_mm_counter(vma->vm_mm, MM_ANONPAGES, nr_pages);
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
 	count_mthp_stat(folio_order(folio), MTHP_STAT_ANON_FAULT_ALLOC);
-#endif
 	folio_add_new_anon_rmap(folio, vma, addr, RMAP_EXCLUSIVE);
 	folio_add_lru_vma(folio, vma);
 setpte:
diff --git a/mm/shmem.c b/mm/shmem.c
index f24dfbd387ba..fce1343f44e6 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1776,9 +1776,7 @@ static struct folio *shmem_alloc_and_add_folio(struct vm_fault *vmf,
 
 			if (pages == HPAGE_PMD_NR)
 				count_vm_event(THP_FILE_FALLBACK);
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
 			count_mthp_stat(order, MTHP_STAT_SHMEM_FALLBACK);
-#endif
 			order = next_order(&suitable_orders, order);
 		}
 	} else {
@@ -1803,10 +1801,8 @@ static struct folio *shmem_alloc_and_add_folio(struct vm_fault *vmf,
 				count_vm_event(THP_FILE_FALLBACK);
 				count_vm_event(THP_FILE_FALLBACK_CHARGE);
 			}
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
 			count_mthp_stat(folio_order(folio), MTHP_STAT_SHMEM_FALLBACK);
 			count_mthp_stat(folio_order(folio), MTHP_STAT_SHMEM_FALLBACK_CHARGE);
-#endif
 		}
 		goto unlock;
 	}
@@ -2180,9 +2176,7 @@ static int shmem_get_folio_gfp(struct inode *inode, pgoff_t index,
 		if (!IS_ERR(folio)) {
 			if (folio_test_pmd_mappable(folio))
 				count_vm_event(THP_FILE_ALLOC);
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
 			count_mthp_stat(folio_order(folio), MTHP_STAT_SHMEM_ALLOC);
-#endif
 			goto alloced;
 		}
 		if (PTR_ERR(folio) == -EEXIST)
-- 
2.43.0

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ