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authorStefan Roesch <shr@devkernel.io>2023-02-10 22:46:45 +0100
committerAndrew Morton <akpm@linux-foundation.org>2023-03-29 01:20:08 +0200
commit739100c88f49a67c6487bb2d826b0b5a2ddc80e2 (patch)
tree0fbb98f3f363e46c3eaf297a12e758bf2c364e40 /include/trace
parentpowerpc/64s: enable MMU_LAZY_TLB_SHOOTDOWN (diff)
downloadlinux-739100c88f49a67c6487bb2d826b0b5a2ddc80e2.tar.xz
linux-739100c88f49a67c6487bb2d826b0b5a2ddc80e2.zip
mm: add tracepoints to ksm
This adds the following tracepoints to ksm: - start / stop scan - ksm enter / exit - merge a page - merge a page with ksm - remove a page - remove a rmap item This patch has been split off from the RFC patch series "mm: process/cgroup ksm support". Link: https://lkml.kernel.org/r/20230210214645.2720847-1-shr@devkernel.io Signed-off-by: Stefan Roesch <shr@devkernel.io> Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/trace')
-rw-r--r--include/trace/events/ksm.h251
1 files changed, 251 insertions, 0 deletions
diff --git a/include/trace/events/ksm.h b/include/trace/events/ksm.h
new file mode 100644
index 000000000000..b5ac35c1d0e8
--- /dev/null
+++ b/include/trace/events/ksm.h
@@ -0,0 +1,251 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM ksm
+
+#if !defined(_TRACE_KSM_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_KSM_H
+
+#include <linux/tracepoint.h>
+
+/**
+ * ksm_scan_template - called for start / stop scan
+ *
+ * @seq: sequence number of scan
+ * @rmap_entries: actual number of rmap entries
+ *
+ * Allows to trace the start / stop of a ksm scan.
+ */
+DECLARE_EVENT_CLASS(ksm_scan_template,
+
+ TP_PROTO(int seq, u32 rmap_entries),
+
+ TP_ARGS(seq, rmap_entries),
+
+ TP_STRUCT__entry(
+ __field(int, seq)
+ __field(u32, rmap_entries)
+ ),
+
+ TP_fast_assign(
+ __entry->seq = seq;
+ __entry->rmap_entries = rmap_entries;
+ ),
+
+ TP_printk("seq %d rmap size %d",
+ __entry->seq, __entry->rmap_entries)
+);
+
+/**
+ * ksm_start_scan - called after a new ksm scan is started
+ *
+ * @seq: sequence number of scan
+ * @rmap_entries: actual number of rmap entries
+ *
+ * Allows to trace the start of a ksm scan.
+ */
+DEFINE_EVENT(ksm_scan_template, ksm_start_scan,
+
+ TP_PROTO(int seq, u32 rmap_entries),
+
+ TP_ARGS(seq, rmap_entries)
+);
+
+/**
+ * ksm_stop_scan - called after a new ksm scan has completed
+ *
+ * @seq: sequence number of scan
+ * @rmap_entries: actual number of rmap entries
+ *
+ * Allows to trace the completion of a ksm scan.
+ */
+DEFINE_EVENT(ksm_scan_template, ksm_stop_scan,
+
+ TP_PROTO(int seq, u32 rmap_entries),
+
+ TP_ARGS(seq, rmap_entries)
+);
+
+/**
+ * ksm_enter - called after a new process has been added / removed from ksm
+ *
+ * @mm: address of the mm object of the process
+ *
+ * Allows to trace the when a process has been added or removed from ksm.
+ */
+DECLARE_EVENT_CLASS(ksm_enter_exit_template,
+
+ TP_PROTO(void *mm),
+
+ TP_ARGS(mm),
+
+ TP_STRUCT__entry(
+ __field(void *, mm)
+ ),
+
+ TP_fast_assign(
+ __entry->mm = mm;
+ ),
+
+ TP_printk("mm %p", __entry->mm)
+);
+
+/**
+ * ksm_enter - called after a new process has been added to ksm
+ *
+ * @mm: address of the mm object of the process
+ *
+ * Allows to trace the when a process has been added to ksm.
+ */
+DEFINE_EVENT(ksm_enter_exit_template, ksm_enter,
+
+ TP_PROTO(void *mm),
+
+ TP_ARGS(mm)
+);
+
+/**
+ * ksm_exit - called after a new process has been removed from ksm
+ *
+ * @mm: address of the mm object of the process
+ *
+ * Allows to trace the when a process has been removed from ksm.
+ */
+DEFINE_EVENT(ksm_enter_exit_template, ksm_exit,
+
+ TP_PROTO(void *mm),
+
+ TP_ARGS(mm)
+);
+
+/**
+ * ksm_merge_one_page - called after a page has been merged
+ *
+ * @pfn: page frame number of ksm page
+ * @rmap_item: address of rmap_item object
+ * @mm: address of the process mm struct
+ * @err: success
+ *
+ * Allows to trace the ksm merging of individual pages.
+ */
+TRACE_EVENT(ksm_merge_one_page,
+
+ TP_PROTO(unsigned long pfn, void *rmap_item, void *mm, int err),
+
+ TP_ARGS(pfn, rmap_item, mm, err),
+
+ TP_STRUCT__entry(
+ __field(unsigned long, pfn)
+ __field(void *, rmap_item)
+ __field(void *, mm)
+ __field(int, err)
+ ),
+
+ TP_fast_assign(
+ __entry->pfn = pfn;
+ __entry->rmap_item = rmap_item;
+ __entry->mm = mm;
+ __entry->err = err;
+ ),
+
+ TP_printk("ksm pfn %lu rmap_item %p mm %p error %d",
+ __entry->pfn, __entry->rmap_item, __entry->mm, __entry->err)
+);
+
+/**
+ * ksm_merge_with_ksm_page - called after a page has been merged with a ksm page
+ *
+ * @ksm_page: address ksm page
+ * @pfn: page frame number of ksm page
+ * @rmap_item: address of rmap_item object
+ * @mm: address of the mm object of the process
+ * @err: success
+ *
+ * Allows to trace the merging of a page with a ksm page.
+ */
+TRACE_EVENT(ksm_merge_with_ksm_page,
+
+ TP_PROTO(void *ksm_page, unsigned long pfn, void *rmap_item, void *mm, int err),
+
+ TP_ARGS(ksm_page, pfn, rmap_item, mm, err),
+
+ TP_STRUCT__entry(
+ __field(void *, ksm_page)
+ __field(unsigned long, pfn)
+ __field(void *, rmap_item)
+ __field(void *, mm)
+ __field(int, err)
+ ),
+
+ TP_fast_assign(
+ __entry->ksm_page = ksm_page;
+ __entry->pfn = pfn;
+ __entry->rmap_item = rmap_item;
+ __entry->mm = mm;
+ __entry->err = err;
+ ),
+
+ TP_printk("%spfn %lu rmap_item %p mm %p error %d",
+ (__entry->ksm_page ? "ksm " : ""),
+ __entry->pfn, __entry->rmap_item, __entry->mm, __entry->err)
+);
+
+/**
+ * ksm_remove_ksm_page - called after a ksm page has been removed
+ *
+ * @pfn: page frame number of ksm page
+ *
+ * Allows to trace the removing of stable ksm pages.
+ */
+TRACE_EVENT(ksm_remove_ksm_page,
+
+ TP_PROTO(unsigned long pfn),
+
+ TP_ARGS(pfn),
+
+ TP_STRUCT__entry(
+ __field(unsigned long, pfn)
+ ),
+
+ TP_fast_assign(
+ __entry->pfn = pfn;
+ ),
+
+ TP_printk("pfn %lu", __entry->pfn)
+);
+
+/**
+ * ksm_remove_rmap_item - called after a rmap_item has been removed from the
+ * stable tree
+ *
+ * @pfn: page frame number of ksm page
+ * @rmap_item: address of rmap_item object
+ * @mm: address of the process mm struct
+ *
+ * Allows to trace the removal of pages from the stable tree list.
+ */
+TRACE_EVENT(ksm_remove_rmap_item,
+
+ TP_PROTO(unsigned long pfn, void *rmap_item, void *mm),
+
+ TP_ARGS(pfn, rmap_item, mm),
+
+ TP_STRUCT__entry(
+ __field(unsigned long, pfn)
+ __field(void *, rmap_item)
+ __field(void *, mm)
+ ),
+
+ TP_fast_assign(
+ __entry->pfn = pfn;
+ __entry->rmap_item = rmap_item;
+ __entry->mm = mm;
+ ),
+
+ TP_printk("pfn %lu rmap_item %p mm %p",
+ __entry->pfn, __entry->rmap_item, __entry->mm)
+);
+
+#endif /* _TRACE_KSM_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>