The patch titled
Subject: tools-adding-support-for-idle-page-tracking-to-tool-fix-2
has been added to the -mm tree. Its filename is
tools-adding-support-for-idle-page-tracking-to-tool-fix-2.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/tools-adding-support-for-idle-page-tracking-to-tool-fix-2.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/tools-adding-support-for-idle-page-tracking-to-tool-fix-2.patch
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------------------------------------------------------
From: Christian Hansen <chansen3@xxxxxxxxx>
Subject: tools-adding-support-for-idle-page-tracking-to-tool-fix-2
reorganize mark_page_idle() logic, add docs
Link: http://lkml.kernel.org/r/20180706172237.21691-1-chansen3@xxxxxxxxx
Signed-off-by: Christian Hansen <chansen3@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/admin-guide/mm/idle_page_tracking.rst | 5 ++
tools/vm/page-types.c | 18 ++++++----
2 files changed, 17 insertions(+), 6 deletions(-)
diff -puN Documentation/admin-guide/mm/idle_page_tracking.rst~tools-adding-support-for-idle-page-tracking-to-tool-fix-2 Documentation/admin-guide/mm/idle_page_tracking.rst
--- a/Documentation/admin-guide/mm/idle_page_tracking.rst~tools-adding-support-for-idle-page-tracking-to-tool-fix-2
+++ a/Documentation/admin-guide/mm/idle_page_tracking.rst
@@ -65,6 +65,11 @@ workload one should:
are not reclaimable, he or she can filter them out using
``/proc/kpageflags``.
+The page-types tool in the tools/vm directory can be used to assist in this.
+If the tool is run initially with the appropriate option, it will mark all the
+queried pages as idle. Subsequent runs of the tool can then show which pages have
+their idle flag cleared in the interim.
+
See :ref:`Documentation/admin-guide/mm/pagemap.rst <pagemap>` for more
information about ``/proc/pid/pagemap``, ``/proc/kpageflags``, and
``/proc/kpagecgroup``.
diff -puN tools/vm/page-types.c~tools-adding-support-for-idle-page-tracking-to-tool-fix-2 tools/vm/page-types.c
--- a/tools/vm/page-types.c~tools-adding-support-for-idle-page-tracking-to-tool-fix-2
+++ a/tools/vm/page-types.c
@@ -597,15 +597,21 @@ static int mark_page_idle(unsigned long
static uint64_t buf;
int len;
- if ((offset / 64 != off / 64) && buf != 0) {
- len = pwrite(page_idle_fd, &buf, 8, 8 * (off / 64));
- if (len < 0) {
- perror("mark page idle");
- return len;
- }
+ if ((offset / 64 == off / 64) || buf == 0) {
+ buf |= 1UL << (offset % 64);
+ off = offset;
+ return 0;
}
+
+ len = pwrite(page_idle_fd, &buf, 8, 8 * (off / 64));
+ if (len < 0) {
+ perror("mark page idle");
+ return len;
+ }
+
buf = 1UL << (offset % 64);
off = offset;
+
return 0;
}
_
Patches currently in -mm which might be from chansen3@xxxxxxxxx are
tools-modifying-page-types-to-include-shared-map-counts.patch
tools-modifying-page-types-to-include-shared-map-counts-fix.patch
tools-adding-support-for-idle-page-tracking-to-tool.patch
tools-adding-support-for-idle-page-tracking-to-tool-fix-2.patch
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