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5088b49730
This adds a new tracepoint for the ksm advisor. It reports the last scan time, the new setting of the pages_to_scan parameter and the average cpu percent usage of the ksmd background thread for the last scan. Link: https://lkml.kernel.org/r/20231218231054.1625219-4-shr@devkernel.io Signed-off-by: Stefan Roesch <shr@devkernel.io> Acked-by: David Hildenbrand <david@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Rik van Riel <riel@surriel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
285 lines
6.0 KiB
C
285 lines
6.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM ksm
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#if !defined(_TRACE_KSM_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_KSM_H
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#include <linux/tracepoint.h>
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/**
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* ksm_scan_template - called for start / stop scan
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*
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* @seq: sequence number of scan
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* @rmap_entries: actual number of rmap entries
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*
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* Allows to trace the start / stop of a ksm scan.
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*/
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DECLARE_EVENT_CLASS(ksm_scan_template,
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TP_PROTO(int seq, u32 rmap_entries),
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TP_ARGS(seq, rmap_entries),
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TP_STRUCT__entry(
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__field(int, seq)
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__field(u32, rmap_entries)
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),
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TP_fast_assign(
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__entry->seq = seq;
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__entry->rmap_entries = rmap_entries;
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),
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TP_printk("seq %d rmap size %d",
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__entry->seq, __entry->rmap_entries)
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);
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/**
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* ksm_start_scan - called after a new ksm scan is started
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*
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* @seq: sequence number of scan
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* @rmap_entries: actual number of rmap entries
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*
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* Allows to trace the start of a ksm scan.
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*/
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DEFINE_EVENT(ksm_scan_template, ksm_start_scan,
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TP_PROTO(int seq, u32 rmap_entries),
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TP_ARGS(seq, rmap_entries)
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);
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/**
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* ksm_stop_scan - called after a new ksm scan has completed
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*
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* @seq: sequence number of scan
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* @rmap_entries: actual number of rmap entries
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*
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* Allows to trace the completion of a ksm scan.
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*/
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DEFINE_EVENT(ksm_scan_template, ksm_stop_scan,
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TP_PROTO(int seq, u32 rmap_entries),
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TP_ARGS(seq, rmap_entries)
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);
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/**
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* ksm_enter - called after a new process has been added / removed from ksm
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*
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* @mm: address of the mm object of the process
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*
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* Allows to trace the when a process has been added or removed from ksm.
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*/
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DECLARE_EVENT_CLASS(ksm_enter_exit_template,
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TP_PROTO(void *mm),
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TP_ARGS(mm),
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TP_STRUCT__entry(
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__field(void *, mm)
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),
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TP_fast_assign(
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__entry->mm = mm;
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),
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TP_printk("mm %p", __entry->mm)
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);
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/**
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* ksm_enter - called after a new process has been added to ksm
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*
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* @mm: address of the mm object of the process
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*
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* Allows to trace the when a process has been added to ksm.
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*/
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DEFINE_EVENT(ksm_enter_exit_template, ksm_enter,
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TP_PROTO(void *mm),
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TP_ARGS(mm)
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);
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/**
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* ksm_exit - called after a new process has been removed from ksm
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*
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* @mm: address of the mm object of the process
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*
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* Allows to trace the when a process has been removed from ksm.
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*/
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DEFINE_EVENT(ksm_enter_exit_template, ksm_exit,
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TP_PROTO(void *mm),
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TP_ARGS(mm)
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);
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/**
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* ksm_merge_one_page - called after a page has been merged
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*
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* @pfn: page frame number of ksm page
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* @rmap_item: address of rmap_item object
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* @mm: address of the process mm struct
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* @err: success
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*
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* Allows to trace the ksm merging of individual pages.
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*/
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TRACE_EVENT(ksm_merge_one_page,
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TP_PROTO(unsigned long pfn, void *rmap_item, void *mm, int err),
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TP_ARGS(pfn, rmap_item, mm, err),
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TP_STRUCT__entry(
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__field(unsigned long, pfn)
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__field(void *, rmap_item)
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__field(void *, mm)
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__field(int, err)
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),
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TP_fast_assign(
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__entry->pfn = pfn;
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__entry->rmap_item = rmap_item;
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__entry->mm = mm;
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__entry->err = err;
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),
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TP_printk("ksm pfn %lu rmap_item %p mm %p error %d",
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__entry->pfn, __entry->rmap_item, __entry->mm, __entry->err)
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);
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/**
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* ksm_merge_with_ksm_page - called after a page has been merged with a ksm page
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*
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* @ksm_page: address ksm page
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* @pfn: page frame number of ksm page
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* @rmap_item: address of rmap_item object
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* @mm: address of the mm object of the process
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* @err: success
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*
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* Allows to trace the merging of a page with a ksm page.
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*/
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TRACE_EVENT(ksm_merge_with_ksm_page,
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TP_PROTO(void *ksm_page, unsigned long pfn, void *rmap_item, void *mm, int err),
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TP_ARGS(ksm_page, pfn, rmap_item, mm, err),
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TP_STRUCT__entry(
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__field(void *, ksm_page)
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__field(unsigned long, pfn)
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__field(void *, rmap_item)
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__field(void *, mm)
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__field(int, err)
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),
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TP_fast_assign(
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__entry->ksm_page = ksm_page;
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__entry->pfn = pfn;
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__entry->rmap_item = rmap_item;
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__entry->mm = mm;
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__entry->err = err;
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),
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TP_printk("%spfn %lu rmap_item %p mm %p error %d",
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(__entry->ksm_page ? "ksm " : ""),
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__entry->pfn, __entry->rmap_item, __entry->mm, __entry->err)
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);
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/**
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* ksm_remove_ksm_page - called after a ksm page has been removed
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*
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* @pfn: page frame number of ksm page
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*
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* Allows to trace the removing of stable ksm pages.
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*/
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TRACE_EVENT(ksm_remove_ksm_page,
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TP_PROTO(unsigned long pfn),
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TP_ARGS(pfn),
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TP_STRUCT__entry(
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__field(unsigned long, pfn)
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),
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TP_fast_assign(
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__entry->pfn = pfn;
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),
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TP_printk("pfn %lu", __entry->pfn)
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);
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/**
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* ksm_remove_rmap_item - called after a rmap_item has been removed from the
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* stable tree
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*
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* @pfn: page frame number of ksm page
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* @rmap_item: address of rmap_item object
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* @mm: address of the process mm struct
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*
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* Allows to trace the removal of pages from the stable tree list.
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*/
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TRACE_EVENT(ksm_remove_rmap_item,
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TP_PROTO(unsigned long pfn, void *rmap_item, void *mm),
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TP_ARGS(pfn, rmap_item, mm),
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TP_STRUCT__entry(
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__field(unsigned long, pfn)
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__field(void *, rmap_item)
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__field(void *, mm)
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),
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TP_fast_assign(
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__entry->pfn = pfn;
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__entry->rmap_item = rmap_item;
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__entry->mm = mm;
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),
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TP_printk("pfn %lu rmap_item %p mm %p",
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__entry->pfn, __entry->rmap_item, __entry->mm)
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);
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/**
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* ksm_advisor - called after the advisor has run
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*
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* @scan_time: scan time in seconds
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* @pages_to_scan: new pages_to_scan value
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* @cpu_percent: cpu usage in percent
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*
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* Allows to trace the ksm advisor.
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*/
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TRACE_EVENT(ksm_advisor,
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TP_PROTO(s64 scan_time, unsigned long pages_to_scan,
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unsigned int cpu_percent),
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TP_ARGS(scan_time, pages_to_scan, cpu_percent),
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TP_STRUCT__entry(
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__field(s64, scan_time)
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__field(unsigned long, pages_to_scan)
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__field(unsigned int, cpu_percent)
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),
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TP_fast_assign(
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__entry->scan_time = scan_time;
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__entry->pages_to_scan = pages_to_scan;
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__entry->cpu_percent = cpu_percent;
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),
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TP_printk("ksm scan time %lld pages_to_scan %lu cpu percent %u",
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__entry->scan_time, __entry->pages_to_scan,
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__entry->cpu_percent)
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);
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#endif /* _TRACE_KSM_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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