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mm: remove swap token code

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The swap token code no longer fits in with the current VM model.  It
does not play well with cgroups or the better NUMA placement code in
development, since we have only one swap token globally.

It also has the potential to mess with scalability of the system, by
increasing the number of non-reclaimable pages on the active and
inactive anon LRU lists.

Last but not least, the swap token code has been broken for a year
without complaints, as reported by Konstantin Khlebnikov.  This suggests
we no longer have much use for it.

The days of sub-1G memory systems with heavy use of swap are over.  If
we ever need thrashing reducing code in the future, we will have to
implement something that does scale.

Signed-off-by: Rik van Riel <riel@redhat.com>
Cc: Konstantin Khlebnikov <khlebnikov@openvz.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Hugh Dickins <hughd@google.com>
Acked-by: Bob Picco <bpicco@meloft.net>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rik van Riel 2012-05-29 15:06:18 -07:00 • committed by Linus Torvalds
parent edad9d2c33
commit e709ffd616
10 changed files with 2 additions and 307 deletions
Download patch file Download diff file Expand all files Collapse all files

82
include/trace/events/vmscan.h
View file

@ -395,88 +395,6 @@ TRACE_EVENT(mm_vmscan_lru_shrink_inactive,
show_reclaim_flags(__entry->reclaim_flags))
);
TRACE_EVENT(replace_swap_token,
TP_PROTO(struct mm_struct *old_mm,
struct mm_struct *new_mm),
TP_ARGS(old_mm, new_mm),
TP_STRUCT__entry(
__field(struct mm_struct*, old_mm)
__field(unsigned int, old_prio)
__field(struct mm_struct*, new_mm)
__field(unsigned int, new_prio)
),
TP_fast_assign(
__entry->old_mm = old_mm;
__entry->old_prio = old_mm ? old_mm->token_priority : 0;
__entry->new_mm = new_mm;
__entry->new_prio = new_mm->token_priority;
),
TP_printk("old_token_mm=%p old_prio=%u new_token_mm=%p new_prio=%u",
__entry->old_mm, __entry->old_prio,
__entry->new_mm, __entry->new_prio)
);
DECLARE_EVENT_CLASS(put_swap_token_template,
TP_PROTO(struct mm_struct *swap_token_mm),
TP_ARGS(swap_token_mm),
TP_STRUCT__entry(
__field(struct mm_struct*, swap_token_mm)
),
TP_fast_assign(
__entry->swap_token_mm = swap_token_mm;
),
TP_printk("token_mm=%p", __entry->swap_token_mm)
);
DEFINE_EVENT(put_swap_token_template, put_swap_token,
TP_PROTO(struct mm_struct *swap_token_mm),
TP_ARGS(swap_token_mm)
);
DEFINE_EVENT_CONDITION(put_swap_token_template, disable_swap_token,
TP_PROTO(struct mm_struct *swap_token_mm),
TP_ARGS(swap_token_mm),
TP_CONDITION(swap_token_mm != NULL)
);
TRACE_EVENT_CONDITION(update_swap_token_priority,
TP_PROTO(struct mm_struct *mm,
unsigned int old_prio,
struct mm_struct *swap_token_mm),
TP_ARGS(mm, old_prio, swap_token_mm),
TP_CONDITION(mm->token_priority != old_prio),
TP_STRUCT__entry(
__field(struct mm_struct*, mm)
__field(unsigned int, old_prio)
__field(unsigned int, new_prio)
__field(struct mm_struct*, swap_token_mm)
__field(unsigned int, swap_token_prio)
),
TP_fast_assign(
__entry->mm = mm;
__entry->old_prio = old_prio;
__entry->new_prio = mm->token_priority;
__entry->swap_token_mm = swap_token_mm;
__entry->swap_token_prio = swap_token_mm ? swap_token_mm->token_priority : 0;
),
TP_printk("mm=%p old_prio=%u new_prio=%u swap_token_mm=%p token_prio=%u",
__entry->mm, __entry->old_prio, __entry->new_prio,
__entry->swap_token_mm, __entry->swap_token_prio)
);
#endif /* _TRACE_VMSCAN_H */
/* This part must be outside protection */