events/ksm.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #undef TRACE_SYSTEM
   3 #define TRACE_SYSTEM ksm
   4
   5 #if !defined(_TRACE_KSM_H) || defined(TRACE_HEADER_MULTI_READ)
   6 #define _TRACE_KSM_H
   7
   8 #include <linux/tracepoint.h>
   9
  10 /**
  11  * ksm_scan_template - called for start / stop scan
  12  *
  13  * @seq:                sequence number of scan
  14  * @rmap_entries:       actual number of rmap entries
  15  *
  16  * Allows to trace the start / stop of a ksm scan.
  17  */
  18 DECLARE_EVENT_CLASS(ksm_scan_template,
  19
  20         TP_PROTO(int seq, u32 rmap_entries),
  21
  22         TP_ARGS(seq, rmap_entries),
  23
  24         TP_STRUCT__entry(
  25                 __field(int,    seq)
  26                 __field(u32,    rmap_entries)
  27         ),
  28
  29         TP_fast_assign(
  30                 __entry->seq            = seq;
  31                 __entry->rmap_entries   = rmap_entries;
  32         ),
  33
  34         TP_printk("seq %d rmap size %d",
  35                         __entry->seq, __entry->rmap_entries)
  36 );
  37
  38 /**
  39  * ksm_start_scan - called after a new ksm scan is started
  40  *
  41  * @seq:                sequence number of scan
  42  * @rmap_entries:       actual number of rmap entries
  43  *
  44  * Allows to trace the start of a ksm scan.
  45  */
  46 DEFINE_EVENT(ksm_scan_template, ksm_start_scan,
  47
  48         TP_PROTO(int seq, u32 rmap_entries),
  49
  50         TP_ARGS(seq, rmap_entries)
  51 );
  52
  53 /**
  54  * ksm_stop_scan - called after a new ksm scan has completed
  55  *
  56  * @seq:                sequence number of scan
  57  * @rmap_entries:       actual number of rmap entries
  58  *
  59  * Allows to trace the completion of a ksm scan.
  60  */
  61 DEFINE_EVENT(ksm_scan_template, ksm_stop_scan,
  62
  63         TP_PROTO(int seq, u32 rmap_entries),
  64
  65         TP_ARGS(seq, rmap_entries)
  66 );
  67
  68 /**
  69  * ksm_enter - called after a new process has been added / removed from ksm
  70  *
  71  * @mm:                 address of the mm object of the process
  72  *
  73  * Allows to trace the when a process has been added or removed from ksm.
  74  */
  75 DECLARE_EVENT_CLASS(ksm_enter_exit_template,
  76
  77         TP_PROTO(void *mm),
  78
  79         TP_ARGS(mm),
  80
  81         TP_STRUCT__entry(
  82                 __field(void *,         mm)
  83         ),
  84
  85         TP_fast_assign(
  86                 __entry->mm     = mm;
  87         ),
  88
  89         TP_printk("mm %p", __entry->mm)
  90 );
  91
  92 /**
  93  * ksm_enter - called after a new process has been added to ksm
  94  *
  95  * @mm:                 address of the mm object of the process
  96  *
  97  * Allows to trace the when a process has been added to ksm.
  98  */
  99 DEFINE_EVENT(ksm_enter_exit_template, ksm_enter,
 100
 101         TP_PROTO(void *mm),
 102
 103         TP_ARGS(mm)
 104 );
 105
 106 /**
 107  * ksm_exit - called after a new process has been removed from ksm
 108  *
 109  * @mm:                 address of the mm object of the process
 110  *
 111  * Allows to trace the when a process has been removed from ksm.
 112  */
 113 DEFINE_EVENT(ksm_enter_exit_template, ksm_exit,
 114
 115         TP_PROTO(void *mm),
 116
 117         TP_ARGS(mm)
 118 );
 119
 120 /**
 121  * ksm_merge_one_page - called after a page has been merged
 122  *
 123  * @pfn:                page frame number of ksm page
 124  * @rmap_item:          address of rmap_item  object
 125  * @mm:                 address of the process mm struct
 126  * @err:                success
 127  *
 128  * Allows to trace the ksm merging of individual pages.
 129  */
 130 TRACE_EVENT(ksm_merge_one_page,
 131
 132         TP_PROTO(unsigned long pfn, void *rmap_item, void *mm, int err),
 133
 134         TP_ARGS(pfn, rmap_item, mm, err),
 135
 136         TP_STRUCT__entry(
 137                 __field(unsigned long,  pfn)
 138                 __field(void *,         rmap_item)
 139                 __field(void *,         mm)
 140                 __field(int,            err)
 141         ),
 142
 143         TP_fast_assign(
 144                 __entry->pfn            = pfn;
 145                 __entry->rmap_item      = rmap_item;
 146                 __entry->mm             = mm;
 147                 __entry->err            = err;
 148         ),
 149
 150         TP_printk("ksm pfn %lu rmap_item %p mm %p error %d",
 151                         __entry->pfn, __entry->rmap_item, __entry->mm, __entry->err)
 152 );
 153
 154 /**
 155  * ksm_merge_with_ksm_page - called after a page has been merged with a ksm page
 156  *
 157  * @ksm_page:           address ksm page
 158  * @pfn:                page frame number of ksm page
 159  * @rmap_item:          address of rmap_item  object
 160  * @mm:                 address of the mm object of the process
 161  * @err:                success
 162  *
 163  * Allows to trace the merging of a page with a ksm page.
 164  */
 165 TRACE_EVENT(ksm_merge_with_ksm_page,
 166
 167         TP_PROTO(void *ksm_page, unsigned long pfn, void *rmap_item, void *mm, int err),
 168
 169         TP_ARGS(ksm_page, pfn, rmap_item, mm, err),
 170
 171         TP_STRUCT__entry(
 172                 __field(void *,         ksm_page)
 173                 __field(unsigned long,  pfn)
 174                 __field(void *,         rmap_item)
 175                 __field(void *,         mm)
 176                 __field(int,            err)
 177         ),
 178
 179         TP_fast_assign(
 180                 __entry->ksm_page       = ksm_page;
 181                 __entry->pfn            = pfn;
 182                 __entry->rmap_item      = rmap_item;
 183                 __entry->mm             = mm;
 184                 __entry->err            = err;
 185         ),
 186
 187         TP_printk("%spfn %lu rmap_item %p mm %p error %d",
 188                   (__entry->ksm_page ? "ksm " : ""),
 189                   __entry->pfn, __entry->rmap_item, __entry->mm, __entry->err)
 190 );
 191
 192 /**
 193  * ksm_remove_ksm_page - called after a ksm page has been removed
 194  *
 195  * @pfn:                page frame number of ksm page
 196  *
 197  * Allows to trace the removing of stable ksm pages.
 198  */
 199 TRACE_EVENT(ksm_remove_ksm_page,
 200
 201         TP_PROTO(unsigned long pfn),
 202
 203         TP_ARGS(pfn),
 204
 205         TP_STRUCT__entry(
 206                 __field(unsigned long, pfn)
 207         ),
 208
 209         TP_fast_assign(
 210                 __entry->pfn = pfn;
 211         ),
 212
 213         TP_printk("pfn %lu", __entry->pfn)
 214 );
 215
 216 /**
 217  * ksm_remove_rmap_item - called after a rmap_item has been removed from the
 218  *                        stable tree
 219  *
 220  * @pfn:                page frame number of ksm page
 221  * @rmap_item:          address of rmap_item  object
 222  * @mm:                 address of the process mm struct
 223  *
 224  * Allows to trace the removal of pages from the stable tree list.
 225  */
 226 TRACE_EVENT(ksm_remove_rmap_item,
 227
 228         TP_PROTO(unsigned long pfn, void *rmap_item, void *mm),
 229
 230         TP_ARGS(pfn, rmap_item, mm),
 231
 232         TP_STRUCT__entry(
 233                 __field(unsigned long,  pfn)
 234                 __field(void *,         rmap_item)
 235                 __field(void *,         mm)
 236         ),
 237
 238         TP_fast_assign(
 239                 __entry->pfn            = pfn;
 240                 __entry->rmap_item      = rmap_item;
 241                 __entry->mm             = mm;
 242         ),
 243
 244         TP_printk("pfn %lu rmap_item %p mm %p",
 245                         __entry->pfn, __entry->rmap_item, __entry->mm)
 246 );
 247
 248 #endif /* _TRACE_KSM_H */
 249
 250 /* This part must be outside protection */
 251 #include <trace/define_trace.h>