Quelle  ksm.h   Sprache: C

/* 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)
);

/**
 * ksm_advisor - called after the advisor has run
 *
 * @scan_time: scan time in seconds
 * @pages_to_scan: new pages_to_scan value
 * @cpu_percent: cpu usage in percent
 *
 * Allows to trace the ksm advisor.
 */
TRACE_EVENT(ksm_advisor,

 TP_PROTO(s64 scan_time, unsigned long pages_to_scan,
   unsigned int cpu_percent),

 TP_ARGS(scan_time, pages_to_scan, cpu_percent),

 TP_STRUCT__entry(
  __field(s64,  scan_time)
  __field(unsigned long, pages_to_scan)
  __field(unsigned int, cpu_percent)
 ),

 TP_fast_assign(
  __entry->scan_time = scan_time;
  __entry->pages_to_scan = pages_to_scan;
  __entry->cpu_percent = cpu_percent;
 ),

 TP_printk("ksm scan time %lld pages_to_scan %lu cpu percent %u",
   __entry->scan_time, __entry->pages_to_scan,
   __entry->cpu_percent)
);

#endif /* _TRACE_KSM_H */

/* This part must be outside protection */
#include <trace/define_trace.h>