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Sun, 06 Aug 2023 00:49:45 -0700 (PDT) From: Xueshi Hu To: mike.kravetz@oracle.com, muchun.song@linux.dev, corbet@lwn.net, akpm@linux-foundation.org, n-horiguchi@ah.jp.nec.com, osalvador@suse.de Cc: linux-mm@kvack.org, Xueshi Hu Subject: [PATCH v2 1/4] mm/hugetlb: fix the inconsistency of /proc/sys/vm/nr_huge_pages Date: Sun, 6 Aug 2023 15:48:50 +0800 Message-Id: <20230806074853.317203-2-xueshi.hu@smartx.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230806074853.317203-1-xueshi.hu@smartx.com> References: <20230806074853.317203-1-xueshi.hu@smartx.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 5720E40003 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: 6oy7niwyxw73rxnywt3rcbdmod8noqpt X-HE-Tag: 1691308187-569446 X-HE-Meta: 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 HJn5W1t+ pFaikZrGSXBdTTa/RLFnWndJM/0nGBe3i5vnzmb92C/eCk2JttkD+esZjK9XH4EJuAqdHubIUhk7PK2NGA/6sP5P91A4Eq/AnGcv+K7O+jpAaOdeK4wncuPjV/CROnOj2T3qTTgCgcrfgBxcHRxoddSJRX0fA3QAnt4F5eigLvlj6UVH+vkfXqt/2myA0FDKTwC/S2QsQMCim7EVhyA91v7cPhwP49O0+81j3NPP9o3uXbkIUc0kpFACV0vLFMoj4N09pSQ4l4S05lOv1eVZJWhpvRg3OT5QWyVoe0cXxEojBBf8czFV/rAcZcerkERDGNqjAEui7BWp/y2yRBWpgSM4QV1QW1wfU62rJ+2HZhI7ud09wb+phuNPWE+oks/2eQicOfsK579OG9rDeoZ1YxXBGzzXqSmbEqACxmOxVi1fw2nlCY+LMVeUACeknDRyxx2cbuXyj/uek8vCB5p7YK3n2PA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: There are currently three 'nr_hugepages' used to export the number of huge pages: 1. /proc/sys/vm/nr_hugepages 2. /sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages 3. /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages For consistency, all three 'nr_hugepages' should return the total number of huge pages. When written, the number of persistent huge pages will be adjusted to the specified value. But, /proc/sys/vm/nr_hugepages returns the number of persistent huge pages. Signed-off-by: Xueshi Hu --- mm/hugetlb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index e327a5a7602c..76af189053f0 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -4606,7 +4606,7 @@ static int hugetlb_sysctl_handler_common(bool obey_mempolicy, void *buffer, size_t *length, loff_t *ppos) { struct hstate *h = &default_hstate; - unsigned long tmp = h->max_huge_pages; + unsigned long tmp = h->nr_huge_pages; int ret; if (!hugepages_supported()) -- 2.40.1