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Date: Wed, 3 Jun 2020 14:50:49 +0800
From: Gavin Guo <gavin.guo@...onical.com>
To: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
akpm@...ux-foundation.org
Subject: [PATCH] mm: thp: Add new kernel parameters transparent_hugepage_defrag/khugepaged_defrag
There is no way to set up the defrag options in boot time. And it's
useful to set it up by default instead of making it work by a
systemd/upstart service or put the command to set up defrag inside
/etc/rc.local.
Signed-off-by: Gavin Guo <gavin.guo@...onical.com>
---
.../admin-guide/kernel-parameters.txt | 18 ++++++++
mm/huge_memory.c | 43 +++++++++++++++++++
mm/khugepaged.c | 21 +++++++++
3 files changed, 82 insertions(+)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 6253849afac2..a9fd020d78db 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2149,6 +2149,16 @@
kgdbwait [KGDB] Stop kernel execution and enter the
kernel debugger at the earliest opportunity.
+ khugepaged_defrag=
+ [KNL]
+ Format: { "0" | "1" }
+ 0 - disable the defrag
+ 1 - enable the defrag
+ Control the defrag efforts when generating the
+ transparent hugepages through khugepaged.
+ See Documentation/admin-guide/mm/transhuge.rst
+ for more details.
+
kmac= [MIPS] korina ethernet MAC address.
Configure the RouterBoard 532 series on-chip
Ethernet adapter MAC address.
@@ -5146,6 +5156,14 @@
See Documentation/admin-guide/mm/transhuge.rst
for more details.
+ transparent_hugepage_defrag=
+ [KNL]
+ Format: [always|defer|defer+madvise|madvise|never]
+ Control the defrag efforts when generating the
+ transparent hugepages.
+ See Documentation/admin-guide/mm/transhuge.rst
+ for more details.
+
tsc= Disable clocksource stability checks for TSC.
Format: <string>
[x86] reliable: mark tsc clocksource as reliable, this
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 8091b780cd7a..86b20a3a1aac 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -481,6 +481,49 @@ static int __init setup_transparent_hugepage(char *str)
}
__setup("transparent_hugepage=", setup_transparent_hugepage);
+static int __init setup_transparent_hugepage_defrag(char *str)
+{
+ int ret = 0;
+ if (!str)
+ goto out;
+ if (!strcmp(str, "always")) {
+ clear_bit(TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG, &transparent_hugepage_flags);
+ clear_bit(TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG, &transparent_hugepage_flags);
+ clear_bit(TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG, &transparent_hugepage_flags);
+ set_bit(TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG, &transparent_hugepage_flags);
+ ret = 1;
+ } else if (!strcmp(str, "defer+madvise")) {
+ clear_bit(TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG, &transparent_hugepage_flags);
+ clear_bit(TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG, &transparent_hugepage_flags);
+ clear_bit(TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG, &transparent_hugepage_flags);
+ set_bit(TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG, &transparent_hugepage_flags);
+ ret = 1;
+ } else if (!strcmp(str, "defer")) {
+ clear_bit(TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG, &transparent_hugepage_flags);
+ clear_bit(TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG, &transparent_hugepage_flags);
+ clear_bit(TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG, &transparent_hugepage_flags);
+ set_bit(TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG, &transparent_hugepage_flags);
+ ret = 1;
+ } else if (!strcmp(str, "madvise")) {
+ clear_bit(TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG, &transparent_hugepage_flags);
+ clear_bit(TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG, &transparent_hugepage_flags);
+ clear_bit(TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG, &transparent_hugepage_flags);
+ set_bit(TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG, &transparent_hugepage_flags);
+ ret = 1;
+ } else if (!strcmp(str, "never")) {
+ clear_bit(TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG, &transparent_hugepage_flags);
+ clear_bit(TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG, &transparent_hugepage_flags);
+ clear_bit(TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG, &transparent_hugepage_flags);
+ clear_bit(TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG, &transparent_hugepage_flags);
+ ret = 1;
+ }
+out:
+ if (!ret)
+ pr_warn("transparent_hugepage_defrag= cannot parse, ignored\n");
+ return ret;
+}
+__setup("transparent_hugepage_defrag=", setup_transparent_hugepage_defrag);
+
pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma)
{
if (likely(vma->vm_flags & VM_WRITE))
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index b043c40a21d4..39bbf2107a23 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -394,6 +394,27 @@ int __init khugepaged_init(void)
return 0;
}
+static int __init setup_khugepaged_defrag(char *str)
+{
+ int ret = 0;
+ if (!str)
+ goto out;
+ if (!strcmp(str, "0")) {
+ clear_bit(TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
+ &transparent_hugepage_flags);
+ ret = 1;
+ } else if (!strcmp(str, "1")) {
+ set_bit(TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
+ &transparent_hugepage_flags);
+ ret = 1;
+ }
+out:
+ if (!ret)
+ pr_warn("khugepaged_defrag= cannot parse, ignored\n");
+ return ret;
+}
+__setup("khugepaged_defrag=", setup_khugepaged_defrag);
+
void __init khugepaged_destroy(void)
{
kmem_cache_destroy(mm_slot_cache);
--
2.17.1
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