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7fe7047597
linux_dsm_epyc7002/include/trace/events/vmscan.h
Dave Hansen 7fe7047597 mm: shrinker trace points: fix negatives 
I was looking at a trace of the slab shrinkers (attachment in this comment):

	https://bugs.freedesktop.org/show_bug.cgi?id=72742#c67

and noticed that "total_scan" can go negative in some cases.  We
used to dump out the "total_scan" variable directly, but some of
the shrinker modifications along the way changed that.

This patch just dumps it out directly, again.  It doesn't make
any sense to derive it from new_nr and nr any more since there
are now other shrinkers that can be running in parallel and
mucking with those values.

Here's an example of the negative numbers in the output:

>          kswapd0-840   [000]   160.869398: mm_shrink_slab_end:   i915_gem_inactive_scan+0x0 0xffff8800037cbc68: unused scan count 10 new scan count 39 total_scan 29 last shrinker return val 256
>          kswapd0-840   [000]   160.869618: mm_shrink_slab_end:   i915_gem_inactive_scan+0x0 0xffff8800037cbc68: unused scan count 39 new scan count 102 total_scan 63 last shrinker return val 256
>          kswapd0-840   [000]   160.870031: mm_shrink_slab_end:   i915_gem_inactive_scan+0x0 0xffff8800037cbc68: unused scan count 102 new scan count 47 total_scan -55 last shrinker return val 768
>          kswapd0-840   [000]   160.870464: mm_shrink_slab_end:   i915_gem_inactive_scan+0x0 0xffff8800037cbc68: unused scan count 47 new scan count 45 total_scan -2 last shrinker return val 768
>          kswapd0-840   [000]   163.384144: mm_shrink_slab_end:   i915_gem_inactive_scan+0x0 0xffff8800037cbc68: unused scan count 45 new scan count 56 total_scan 11 last shrinker return val 0
>          kswapd0-840   [000]   163.384297: mm_shrink_slab_end:   i915_gem_inactive_scan+0x0 0xffff8800037cbc68: unused scan count 56 new scan count 15 total_scan -41 last shrinker return val 256
>          kswapd0-840   [000]   163.384414: mm_shrink_slab_end:   i915_gem_inactive_scan+0x0 0xffff8800037cbc68: unused scan count 15 new scan count 117 total_scan 102 last shrinker return val 0
>          kswapd0-840   [000]   163.384657: mm_shrink_slab_end:   i915_gem_inactive_scan+0x0 0xffff8800037cbc68: unused scan count 117 new scan count 36 total_scan -81 last shrinker return val 512
>          kswapd0-840   [000]   163.384880: mm_shrink_slab_end:   i915_gem_inactive_scan+0x0 0xffff8800037cbc68: unused scan count 36 new scan count 111 total_scan 75 last shrinker return val 256
>          kswapd0-840   [000]   163.385256: mm_shrink_slab_end:   i915_gem_inactive_scan+0x0 0xffff8800037cbc68: unused scan count 111 new scan count 34 total_scan -77 last shrinker return val 768
>          kswapd0-840   [000]   163.385598: mm_shrink_slab_end:   i915_gem_inactive_scan+0x0 0xffff8800037cbc68: unused scan count 34 new scan count 122 total_scan 88 last shrinker return val 512

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Dave Chinner <david@fromorbit.com>
Cc: Konstantin Khlebnikov <khlebnikov@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-06-04 16:54:04 -07:00

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#undef TRACE_SYSTEM
#define TRACE_SYSTEM vmscan
#if !defined(_TRACE_VMSCAN_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_VMSCAN_H
#include <linux/types.h>
#include <linux/tracepoint.h>
#include <linux/mm.h>
#include <linux/memcontrol.h>
#include <trace/events/gfpflags.h>
#define RECLAIM_WB_ANON 0x0001u
#define RECLAIM_WB_FILE 0x0002u
#define RECLAIM_WB_MIXED 0x0010u
#define RECLAIM_WB_SYNC 0x0004u /* Unused, all reclaim async */
#define RECLAIM_WB_ASYNC 0x0008u
#define show_reclaim_flags(flags) \
(flags) ? __print_flags(flags, "|", \
{RECLAIM_WB_ANON, "RECLAIM_WB_ANON"}, \
{RECLAIM_WB_FILE, "RECLAIM_WB_FILE"}, \
{RECLAIM_WB_MIXED, "RECLAIM_WB_MIXED"}, \
{RECLAIM_WB_SYNC, "RECLAIM_WB_SYNC"}, \
{RECLAIM_WB_ASYNC, "RECLAIM_WB_ASYNC"} \
) : "RECLAIM_WB_NONE"
#define trace_reclaim_flags(page) ( \
(page_is_file_cache(page) ? RECLAIM_WB_FILE : RECLAIM_WB_ANON) | \
(RECLAIM_WB_ASYNC) \
)
#define trace_shrink_flags(file) \
( \
(file ? RECLAIM_WB_FILE : RECLAIM_WB_ANON) | \
(RECLAIM_WB_ASYNC) \
)
TRACE_EVENT(mm_vmscan_kswapd_sleep,
TP_PROTO(int nid),
TP_ARGS(nid),
TP_STRUCT__entry(
__field( int, nid )
),
TP_fast_assign(
__entry->nid = nid;
),
TP_printk("nid=%d", __entry->nid)
);
TRACE_EVENT(mm_vmscan_kswapd_wake,
TP_PROTO(int nid, int order),
TP_ARGS(nid, order),
TP_STRUCT__entry(
__field( int, nid )
__field( int, order )
),
TP_fast_assign(
__entry->nid = nid;
__entry->order = order;
),
TP_printk("nid=%d order=%d", __entry->nid, __entry->order)
);
TRACE_EVENT(mm_vmscan_wakeup_kswapd,
TP_PROTO(int nid, int zid, int order),
TP_ARGS(nid, zid, order),
TP_STRUCT__entry(
__field( int, nid )
__field( int, zid )
__field( int, order )
),
TP_fast_assign(
__entry->nid = nid;
__entry->zid = zid;
__entry->order = order;
),
TP_printk("nid=%d zid=%d order=%d",
__entry->nid,
__entry->zid,
__entry->order)
);
DECLARE_EVENT_CLASS(mm_vmscan_direct_reclaim_begin_template,
TP_PROTO(int order, int may_writepage, gfp_t gfp_flags),
TP_ARGS(order, may_writepage, gfp_flags),
TP_STRUCT__entry(
__field( int, order )
__field( int, may_writepage )
__field( gfp_t, gfp_flags )
),
TP_fast_assign(
__entry->order = order;
__entry->may_writepage = may_writepage;
__entry->gfp_flags = gfp_flags;
),
TP_printk("order=%d may_writepage=%d gfp_flags=%s",
__entry->order,
__entry->may_writepage,
show_gfp_flags(__entry->gfp_flags))
);
DEFINE_EVENT(mm_vmscan_direct_reclaim_begin_template, mm_vmscan_direct_reclaim_begin,
TP_PROTO(int order, int may_writepage, gfp_t gfp_flags),
TP_ARGS(order, may_writepage, gfp_flags)
);
DEFINE_EVENT(mm_vmscan_direct_reclaim_begin_template, mm_vmscan_memcg_reclaim_begin,
TP_PROTO(int order, int may_writepage, gfp_t gfp_flags),
TP_ARGS(order, may_writepage, gfp_flags)
);
DEFINE_EVENT(mm_vmscan_direct_reclaim_begin_template, mm_vmscan_memcg_softlimit_reclaim_begin,
TP_PROTO(int order, int may_writepage, gfp_t gfp_flags),
TP_ARGS(order, may_writepage, gfp_flags)
);
DECLARE_EVENT_CLASS(mm_vmscan_direct_reclaim_end_template,
TP_PROTO(unsigned long nr_reclaimed),
TP_ARGS(nr_reclaimed),
TP_STRUCT__entry(
__field( unsigned long, nr_reclaimed )
),
TP_fast_assign(
__entry->nr_reclaimed = nr_reclaimed;
),
TP_printk("nr_reclaimed=%lu", __entry->nr_reclaimed)
);
DEFINE_EVENT(mm_vmscan_direct_reclaim_end_template, mm_vmscan_direct_reclaim_end,
TP_PROTO(unsigned long nr_reclaimed),
TP_ARGS(nr_reclaimed)
);
DEFINE_EVENT(mm_vmscan_direct_reclaim_end_template, mm_vmscan_memcg_reclaim_end,
TP_PROTO(unsigned long nr_reclaimed),
TP_ARGS(nr_reclaimed)
);
DEFINE_EVENT(mm_vmscan_direct_reclaim_end_template, mm_vmscan_memcg_softlimit_reclaim_end,
TP_PROTO(unsigned long nr_reclaimed),
TP_ARGS(nr_reclaimed)
);
TRACE_EVENT(mm_shrink_slab_start,
TP_PROTO(struct shrinker *shr, struct shrink_control *sc,
long nr_objects_to_shrink, unsigned long pgs_scanned,
unsigned long lru_pgs, unsigned long cache_items,
unsigned long long delta, unsigned long total_scan),
TP_ARGS(shr, sc, nr_objects_to_shrink, pgs_scanned, lru_pgs,
cache_items, delta, total_scan),
TP_STRUCT__entry(
__field(struct shrinker *, shr)
__field(void *, shrink)
__field(long, nr_objects_to_shrink)
__field(gfp_t, gfp_flags)
__field(unsigned long, pgs_scanned)
__field(unsigned long, lru_pgs)
__field(unsigned long, cache_items)
__field(unsigned long long, delta)
__field(unsigned long, total_scan)
),
TP_fast_assign(
__entry->shr = shr;
__entry->shrink = shr->scan_objects;
__entry->nr_objects_to_shrink = nr_objects_to_shrink;
__entry->gfp_flags = sc->gfp_mask;
__entry->pgs_scanned = pgs_scanned;
__entry->lru_pgs = lru_pgs;
__entry->cache_items = cache_items;
__entry->delta = delta;
__entry->total_scan = total_scan;
),
TP_printk("%pF %p: objects to shrink %ld gfp_flags %s pgs_scanned %ld lru_pgs %ld cache items %ld delta %lld total_scan %ld",
__entry->shrink,
__entry->shr,
__entry->nr_objects_to_shrink,
show_gfp_flags(__entry->gfp_flags),
__entry->pgs_scanned,
__entry->lru_pgs,
__entry->cache_items,
__entry->delta,
__entry->total_scan)
);
TRACE_EVENT(mm_shrink_slab_end,
TP_PROTO(struct shrinker *shr, int shrinker_retval,
long unused_scan_cnt, long new_scan_cnt, long total_scan),
TP_ARGS(shr, shrinker_retval, unused_scan_cnt, new_scan_cnt, total_scan),
TP_STRUCT__entry(
__field(struct shrinker *, shr)
__field(void *, shrink)
__field(long, unused_scan)
__field(long, new_scan)
__field(int, retval)
__field(long, total_scan)
),
TP_fast_assign(
__entry->shr = shr;
__entry->shrink = shr->scan_objects;
__entry->unused_scan = unused_scan_cnt;
__entry->new_scan = new_scan_cnt;
__entry->retval = shrinker_retval;
__entry->total_scan = total_scan;
),
TP_printk("%pF %p: unused scan count %ld new scan count %ld total_scan %ld last shrinker return val %d",
__entry->shrink,
__entry->shr,
__entry->unused_scan,
__entry->new_scan,
__entry->total_scan,
__entry->retval)
);
DECLARE_EVENT_CLASS(mm_vmscan_lru_isolate_template,
TP_PROTO(int order,
unsigned long nr_requested,
unsigned long nr_scanned,
unsigned long nr_taken,
isolate_mode_t isolate_mode,
int file),
TP_ARGS(order, nr_requested, nr_scanned, nr_taken, isolate_mode, file),
TP_STRUCT__entry(
__field(int, order)
__field(unsigned long, nr_requested)
__field(unsigned long, nr_scanned)
__field(unsigned long, nr_taken)
__field(isolate_mode_t, isolate_mode)
__field(int, file)
),
TP_fast_assign(
__entry->order = order;
__entry->nr_requested = nr_requested;
__entry->nr_scanned = nr_scanned;
__entry->nr_taken = nr_taken;
__entry->isolate_mode = isolate_mode;
__entry->file = file;
),
TP_printk("isolate_mode=%d order=%d nr_requested=%lu nr_scanned=%lu nr_taken=%lu file=%d",
__entry->isolate_mode,
__entry->order,
__entry->nr_requested,
__entry->nr_scanned,
__entry->nr_taken,
__entry->file)
);
DEFINE_EVENT(mm_vmscan_lru_isolate_template, mm_vmscan_lru_isolate,
TP_PROTO(int order,
unsigned long nr_requested,
unsigned long nr_scanned,
unsigned long nr_taken,
isolate_mode_t isolate_mode,
int file),
TP_ARGS(order, nr_requested, nr_scanned, nr_taken, isolate_mode, file)
);
DEFINE_EVENT(mm_vmscan_lru_isolate_template, mm_vmscan_memcg_isolate,
TP_PROTO(int order,
unsigned long nr_requested,
unsigned long nr_scanned,
unsigned long nr_taken,
isolate_mode_t isolate_mode,
int file),
TP_ARGS(order, nr_requested, nr_scanned, nr_taken, isolate_mode, file)
);
TRACE_EVENT(mm_vmscan_writepage,
TP_PROTO(struct page *page,
int reclaim_flags),
TP_ARGS(page, reclaim_flags),
TP_STRUCT__entry(
__field(struct page *, page)
__field(int, reclaim_flags)
),
TP_fast_assign(
__entry->page = page;
__entry->reclaim_flags = reclaim_flags;
),
TP_printk("page=%p pfn=%lu flags=%s",
__entry->page,
page_to_pfn(__entry->page),
show_reclaim_flags(__entry->reclaim_flags))
);
TRACE_EVENT(mm_vmscan_lru_shrink_inactive,
TP_PROTO(int nid, int zid,
unsigned long nr_scanned, unsigned long nr_reclaimed,
int priority, int reclaim_flags),
TP_ARGS(nid, zid, nr_scanned, nr_reclaimed, priority, reclaim_flags),
TP_STRUCT__entry(
__field(int, nid)
__field(int, zid)
__field(unsigned long, nr_scanned)
__field(unsigned long, nr_reclaimed)
__field(int, priority)
__field(int, reclaim_flags)
),
TP_fast_assign(
__entry->nid = nid;
__entry->zid = zid;
__entry->nr_scanned = nr_scanned;
__entry->nr_reclaimed = nr_reclaimed;
__entry->priority = priority;
__entry->reclaim_flags = reclaim_flags;
),
TP_printk("nid=%d zid=%d nr_scanned=%ld nr_reclaimed=%ld priority=%d flags=%s",
__entry->nid, __entry->zid,
__entry->nr_scanned, __entry->nr_reclaimed,
__entry->priority,
show_reclaim_flags(__entry->reclaim_flags))
);
#endif /* _TRACE_VMSCAN_H */
/* This part must be outside protection */
#include <trace/define_trace.h>
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