From: Muchun Song <songmuchun@bytedance.com>
To: corbet@lwn.net, mike.kravetz@oracle.com, tglx@linutronix.de,
mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com,
dave.hansen@linux.intel.com, luto@kernel.org,
peterz@infradead.org, viro@zeniv.linux.org.uk,
akpm@linux-foundation.org, paulmck@kernel.org,
mchehab+huawei@kernel.org, pawan.kumar.gupta@linux.intel.com,
rdunlap@infradead.org, oneukum@suse.com,
anshuman.khandual@arm.com, jroedel@suse.de,
almasrymina@google.com, rientjes@google.com, willy@infradead.org,
osalvador@suse.de, mhocko@suse.com, song.bao.hua@hisilicon.com
Cc: duanxiongchun@bytedance.com, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-fsdevel@vger.kernel.org,
Muchun Song <songmuchun@bytedance.com>
Subject: [PATCH v6 14/16] mm/hugetlb: Add a kernel parameter hugetlb_free_vmemmap
Date: Tue, 24 Nov 2020 17:52:57 +0800 [thread overview]
Message-ID: <20201124095259.58755-15-songmuchun@bytedance.com> (raw)
In-Reply-To: <20201124095259.58755-1-songmuchun@bytedance.com>
Add a kernel parameter hugetlb_free_vmemmap to disable the feature of
freeing unused vmemmap pages associated with each hugetlb page on boot.
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
---
Documentation/admin-guide/kernel-parameters.txt | 9 +++++++++
Documentation/admin-guide/mm/hugetlbpage.rst | 3 +++
mm/hugetlb_vmemmap.c | 19 ++++++++++++++++++-
3 files changed, 30 insertions(+), 1 deletion(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 5debfe238027..d28c3acde965 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1551,6 +1551,15 @@
Documentation/admin-guide/mm/hugetlbpage.rst.
Format: size[KMG]
+ hugetlb_free_vmemmap=
+ [KNL] When CONFIG_HUGETLB_PAGE_FREE_VMEMMAP is set,
+ this controls freeing unused vmemmap pages associated
+ with each HugeTLB page.
+ Format: { on | off (default) }
+
+ on: enable the feature
+ off: disable the feature
+
hung_task_panic=
[KNL] Should the hung task detector generate panics.
Format: 0 | 1
diff --git a/Documentation/admin-guide/mm/hugetlbpage.rst b/Documentation/admin-guide/mm/hugetlbpage.rst
index f7b1c7462991..6a8b57f6d3b7 100644
--- a/Documentation/admin-guide/mm/hugetlbpage.rst
+++ b/Documentation/admin-guide/mm/hugetlbpage.rst
@@ -145,6 +145,9 @@ default_hugepagesz
will all result in 256 2M huge pages being allocated. Valid default
huge page size is architecture dependent.
+hugetlb_free_vmemmap
+ When CONFIG_HUGETLB_PAGE_FREE_VMEMMAP is set, this enables freeing
+ unused vmemmap pages associated each HugeTLB page.
When multiple huge page sizes are supported, ``/proc/sys/vm/nr_hugepages``
indicates the current number of pre-allocated huge pages of the default size.
diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c
index 509ca451e232..b2222f8d1245 100644
--- a/mm/hugetlb_vmemmap.c
+++ b/mm/hugetlb_vmemmap.c
@@ -131,6 +131,22 @@ typedef void (*vmemmap_pte_remap_func_t)(struct page *reuse, pte_t *ptep,
unsigned long start, unsigned long end,
void *priv);
+static bool hugetlb_free_vmemmap_enabled __initdata;
+
+static int __init early_hugetlb_free_vmemmap_param(char *buf)
+{
+ if (!buf)
+ return -EINVAL;
+
+ if (!strcmp(buf, "on"))
+ hugetlb_free_vmemmap_enabled = true;
+ else if (strcmp(buf, "off"))
+ return -EINVAL;
+
+ return 0;
+}
+early_param("hugetlb_free_vmemmap", early_hugetlb_free_vmemmap_param);
+
static inline unsigned int vmemmap_pages_per_hpage(struct hstate *h)
{
return free_vmemmap_pages_per_hpage(h) + RESERVE_VMEMMAP_NR;
@@ -322,7 +338,8 @@ void __init hugetlb_vmemmap_init(struct hstate *h)
unsigned int order = huge_page_order(h);
unsigned int vmemmap_pages;
- if (!is_power_of_2(sizeof(struct page))) {
+ if (!is_power_of_2(sizeof(struct page)) ||
+ !hugetlb_free_vmemmap_enabled) {
pr_info("disable freeing vmemmap pages for %s\n", h->name);
return;
}
--
2.11.0
next prev parent reply other threads:[~2020-11-24 9:59 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-24 9:52 [PATCH v6 00/16] Free some vmemmap pages of hugetlb page Muchun Song
2020-11-24 9:52 ` [PATCH v6 01/16] mm/memory_hotplug: Move bootmem info registration API to bootmem_info.c Muchun Song
2021-06-10 12:15 ` chengkaitao
2020-11-24 9:52 ` [PATCH v6 02/16] mm/memory_hotplug: Move {get,put}_page_bootmem() " Muchun Song
2020-11-24 9:52 ` [PATCH v6 03/16] mm/hugetlb: Introduce a new config HUGETLB_PAGE_FREE_VMEMMAP Muchun Song
2020-11-24 9:52 ` [PATCH v6 04/16] mm/hugetlb: Introduce nr_free_vmemmap_pages in the struct hstate Muchun Song
2020-11-24 9:52 ` [PATCH v6 05/16] mm/bootmem_info: Introduce {free,prepare}_vmemmap_page() Muchun Song
2020-11-24 9:52 ` [PATCH v6 06/16] mm/hugetlb: Disable freeing vmemmap if struct page size is not power of two Muchun Song
2020-11-24 9:52 ` [PATCH v6 07/16] x86/mm/64: Disable PMD page mapping of vmemmap Muchun Song
2020-11-24 10:24 ` Oscar Salvador
2020-11-24 10:31 ` Song Bao Hua (Barry Song)
2020-11-24 11:13 ` [External] " Muchun Song
2020-11-24 9:52 ` [PATCH v6 08/16] mm/hugetlb: Free the vmemmap pages associated with each hugetlb page Muchun Song
2020-11-24 9:52 ` [PATCH v6 09/16] mm/hugetlb: Defer freeing of HugeTLB pages Muchun Song
2020-11-24 11:51 ` Michal Hocko
2020-11-24 12:45 ` [External] " Muchun Song
2020-11-24 13:14 ` Michal Hocko
2020-11-24 9:52 ` [PATCH v6 10/16] mm/hugetlb: Allocate the vmemmap pages associated with each hugetlb page Muchun Song
2020-11-24 9:52 ` [PATCH v6 11/16] mm/hugetlb: Introduce remap_huge_page_pmd_vmemmap helper Muchun Song
2020-11-24 9:52 ` [PATCH v6 12/16] mm/hugetlb: Set the PageHWPoison to the raw error page Muchun Song
2020-11-24 9:52 ` [PATCH v6 13/16] mm/hugetlb: Flush work when dissolving hugetlb page Muchun Song
2020-11-24 9:52 ` Muchun Song [this message]
2020-11-24 10:53 ` [PATCH v6 14/16] mm/hugetlb: Add a kernel parameter hugetlb_free_vmemmap Song Bao Hua (Barry Song)
2020-11-24 11:07 ` [External] " Muchun Song
2020-11-24 9:52 ` [PATCH v6 15/16] mm/hugetlb: Gather discrete indexes of tail page Muchun Song
2020-11-24 9:52 ` [PATCH v6 16/16] mm/hugetlb: Add BUILD_BUG_ON to catch invalid usage of tail struct page Muchun Song
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