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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2020-06-04 02:00:30 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-04 06:09:46 +0300
commit71a2c112a0f6da497e1b44e18e97b1716c240518 (patch)
treeb63583bbd175c33167127a60f8cf7142b9eb6991 /Documentation/admin-guide
parent3917c80280c93a7123f1a3a6dcdb10a3ea19737d (diff)
downloadlinux-71a2c112a0f6da497e1b44e18e97b1716c240518.tar.xz
khugepaged: introduce 'max_ptes_shared' tunable
'max_ptes_shared' specifies how many pages can be shared across multiple processes. Exceeding the number would block the collapse:: /sys/kernel/mm/transparent_hugepage/khugepaged/max_ptes_shared A higher value may increase memory footprint for some workloads. By default, at least half of pages has to be not shared. [colin.king@canonical.com: fix several spelling mistakes] Link: http://lkml.kernel.org/r/20200420084241.65433-1-colin.king@canonical.com Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Tested-by: Zi Yan <ziy@nvidia.com> Reviewed-by: William Kucharski <william.kucharski@oracle.com> Reviewed-by: Zi Yan <ziy@nvidia.com> Acked-by: Yang Shi <yang.shi@linux.alibaba.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Ralph Campbell <rcampbell@nvidia.com> Link: http://lkml.kernel.org/r/20200416160026.16538-9-kirill.shutemov@linux.intel.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/admin-guide')
-rw-r--r--Documentation/admin-guide/mm/transhuge.rst7
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/admin-guide/mm/transhuge.rst b/Documentation/admin-guide/mm/transhuge.rst
index 2f31de8f7c74..6a233e42be08 100644
--- a/Documentation/admin-guide/mm/transhuge.rst
+++ b/Documentation/admin-guide/mm/transhuge.rst
@@ -220,6 +220,13 @@ memory. A lower value can prevent THPs from being
collapsed, resulting fewer pages being collapsed into
THPs, and lower memory access performance.
+``max_ptes_shared`` specifies how many pages can be shared across multiple
+processes. Exceeding the number would block the collapse::
+
+ /sys/kernel/mm/transparent_hugepage/khugepaged/max_ptes_shared
+
+A higher value may increase memory footprint for some workloads.
+
Boot parameter
==============