55 lines
2.2 KiB
Diff
55 lines
2.2 KiB
Diff
From 093316a897a2eb4972a7a3a5888f40975d03f6bf Mon Sep 17 00:00:00 2001
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From: Brice Goglin <Brice.Goglin@inria.fr>
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Date: Tue, 5 Apr 2022 17:39:50 +0200
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Subject: [PATCH] linux: (partial) fix the discovery of hugepages on btrfs
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fsroot
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btrfs always returns 1 in directory stat.st_nlink.
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It breaks make check in tests/linux/ because the hugepages discovery
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uses st_nlink to allocate the memory page_types array.
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Always allocate at least 3 page_types slots
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(enough for all known cases, 1 for normal, 2 for huge pages)
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(partially cherry-picked from commit 7f351cec9bfe54a031f35ad16c9cfb99784d76dc)
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We don't reallocate later if needed as in 2.x commit 7f351cec9bfe54a031f35ad16c9cfb99784d76dc
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because v1.11 doesn't deserve a complete fix. Just commit the minimal change
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so that tests/linux/2i386-2t-hugepagesizecount with HWLOC_PAGESIZE_DEBUG=4096
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doesn't crash in btrfs anymore (test-topology.sh fails during make check if /tmp is in btrfs).
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Thanks to Philippe Swartvagher for the report.
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Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>
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---
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src/topology-linux.c | 11 +++++++++--
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1 file changed, 9 insertions(+), 2 deletions(-)
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diff --git a/src/topology-linux.c b/src/topology-linux.c
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index 58c275fea..269eca7f5 100644
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--- a/src/topology-linux.c
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+++ b/src/topology-linux.c
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@@ -1,6 +1,6 @@
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/*
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* Copyright © 2009 CNRS
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- * Copyright © 2009-2019 Inria. All rights reserved.
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+ * Copyright © 2009-2022 Inria. All rights reserved.
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* Copyright © 2009-2013, 2015 Université Bordeaux
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* Copyright © 2009-2014 Cisco Systems, Inc. All rights reserved.
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* Copyright © 2015 Intel, Inc. All rights reserved.
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@@ -2329,7 +2329,14 @@ hwloc_get_procfs_meminfo_info(struct hwloc_topology *topology,
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err = hwloc_stat("/sys/kernel/mm/hugepages", &st, data->root_fd);
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if (!err) {
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- types = 1 + st.st_nlink-2;
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+ types = 1 /* normal non-huge size */ + st.st_nlink - 2 /* ignore . and .. */;
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+ if (types < 3)
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+ /* some buggy filesystems (e.g. btrfs when reading from fsroot)
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+ * return wrong st_nlink for directories (always 1 for btrfs).
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+ * use 3 as a sane default (default page + 2 huge sizes).
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+ * hwloc_parse_hugepages_info() will extend it if needed.
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+ */
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+ types = 3;
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has_sysfs_hugepages = 1;
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}
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