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![Mel Gorman](/assets/img/avatar_default.png)
Memcg reclaim throttles on congestion if no reclaim progress is made. This makes little sense, it might be due to writeback or a host of other factors. For !memcg reclaim, it's messy. Direct reclaim primarily is throttled in the page allocator if it is failing to make progress. Kswapd throttles if too many pages are under writeback and marked for immediate reclaim. This patch explicitly throttles if reclaim is failing to make progress. [vbabka@suse.cz: Remove redundant code] Link: https://lkml.kernel.org/r/20211022144651.19914-4-mgorman@techsingularity.net Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Andreas Dilger <adilger.kernel@dilger.ca> Cc: "Darrick J . Wong" <djwong@kernel.org> Cc: Dave Chinner <david@fromorbit.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Matthew Wilcox <willy@infradead.org> Cc: Michal Hocko <mhocko@suse.com> Cc: NeilBrown <neilb@suse.de> Cc: Rik van Riel <riel@surriel.com> Cc: "Theodore Ts'o" <tytso@mit.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
498 lines
12 KiB
C
498 lines
12 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM vmscan
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#if !defined(_TRACE_VMSCAN_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_VMSCAN_H
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#include <linux/types.h>
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#include <linux/tracepoint.h>
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#include <linux/mm.h>
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#include <linux/memcontrol.h>
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#include <trace/events/mmflags.h>
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#define RECLAIM_WB_ANON 0x0001u
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#define RECLAIM_WB_FILE 0x0002u
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#define RECLAIM_WB_MIXED 0x0010u
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#define RECLAIM_WB_SYNC 0x0004u /* Unused, all reclaim async */
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#define RECLAIM_WB_ASYNC 0x0008u
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#define RECLAIM_WB_LRU (RECLAIM_WB_ANON|RECLAIM_WB_FILE)
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#define show_reclaim_flags(flags) \
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(flags) ? __print_flags(flags, "|", \
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{RECLAIM_WB_ANON, "RECLAIM_WB_ANON"}, \
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{RECLAIM_WB_FILE, "RECLAIM_WB_FILE"}, \
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{RECLAIM_WB_MIXED, "RECLAIM_WB_MIXED"}, \
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{RECLAIM_WB_SYNC, "RECLAIM_WB_SYNC"}, \
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{RECLAIM_WB_ASYNC, "RECLAIM_WB_ASYNC"} \
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) : "RECLAIM_WB_NONE"
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#define _VMSCAN_THROTTLE_WRITEBACK (1 << VMSCAN_THROTTLE_WRITEBACK)
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#define _VMSCAN_THROTTLE_ISOLATED (1 << VMSCAN_THROTTLE_ISOLATED)
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#define _VMSCAN_THROTTLE_NOPROGRESS (1 << VMSCAN_THROTTLE_NOPROGRESS)
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#define show_throttle_flags(flags) \
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(flags) ? __print_flags(flags, "|", \
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{_VMSCAN_THROTTLE_WRITEBACK, "VMSCAN_THROTTLE_WRITEBACK"}, \
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{_VMSCAN_THROTTLE_ISOLATED, "VMSCAN_THROTTLE_ISOLATED"}, \
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{_VMSCAN_THROTTLE_NOPROGRESS, "VMSCAN_THROTTLE_NOPROGRESS"} \
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) : "VMSCAN_THROTTLE_NONE"
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#define trace_reclaim_flags(file) ( \
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(file ? RECLAIM_WB_FILE : RECLAIM_WB_ANON) | \
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(RECLAIM_WB_ASYNC) \
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)
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TRACE_EVENT(mm_vmscan_kswapd_sleep,
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TP_PROTO(int nid),
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TP_ARGS(nid),
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TP_STRUCT__entry(
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__field( int, nid )
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),
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TP_fast_assign(
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__entry->nid = nid;
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),
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TP_printk("nid=%d", __entry->nid)
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);
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TRACE_EVENT(mm_vmscan_kswapd_wake,
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TP_PROTO(int nid, int zid, int order),
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TP_ARGS(nid, zid, order),
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TP_STRUCT__entry(
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__field( int, nid )
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__field( int, zid )
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__field( int, order )
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),
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TP_fast_assign(
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__entry->nid = nid;
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__entry->zid = zid;
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__entry->order = order;
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),
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TP_printk("nid=%d order=%d",
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__entry->nid,
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__entry->order)
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);
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TRACE_EVENT(mm_vmscan_wakeup_kswapd,
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TP_PROTO(int nid, int zid, int order, gfp_t gfp_flags),
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TP_ARGS(nid, zid, order, gfp_flags),
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TP_STRUCT__entry(
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__field( int, nid )
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__field( int, zid )
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__field( int, order )
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__field( gfp_t, gfp_flags )
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),
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TP_fast_assign(
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__entry->nid = nid;
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__entry->zid = zid;
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__entry->order = order;
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__entry->gfp_flags = gfp_flags;
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),
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TP_printk("nid=%d order=%d gfp_flags=%s",
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__entry->nid,
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__entry->order,
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show_gfp_flags(__entry->gfp_flags))
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);
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DECLARE_EVENT_CLASS(mm_vmscan_direct_reclaim_begin_template,
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TP_PROTO(int order, gfp_t gfp_flags),
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TP_ARGS(order, gfp_flags),
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TP_STRUCT__entry(
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__field( int, order )
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__field( gfp_t, gfp_flags )
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),
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TP_fast_assign(
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__entry->order = order;
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__entry->gfp_flags = gfp_flags;
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),
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TP_printk("order=%d gfp_flags=%s",
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__entry->order,
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show_gfp_flags(__entry->gfp_flags))
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);
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DEFINE_EVENT(mm_vmscan_direct_reclaim_begin_template, mm_vmscan_direct_reclaim_begin,
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TP_PROTO(int order, gfp_t gfp_flags),
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TP_ARGS(order, gfp_flags)
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);
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#ifdef CONFIG_MEMCG
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DEFINE_EVENT(mm_vmscan_direct_reclaim_begin_template, mm_vmscan_memcg_reclaim_begin,
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TP_PROTO(int order, gfp_t gfp_flags),
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TP_ARGS(order, gfp_flags)
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);
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DEFINE_EVENT(mm_vmscan_direct_reclaim_begin_template, mm_vmscan_memcg_softlimit_reclaim_begin,
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TP_PROTO(int order, gfp_t gfp_flags),
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TP_ARGS(order, gfp_flags)
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);
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#endif /* CONFIG_MEMCG */
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DECLARE_EVENT_CLASS(mm_vmscan_direct_reclaim_end_template,
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TP_PROTO(unsigned long nr_reclaimed),
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TP_ARGS(nr_reclaimed),
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TP_STRUCT__entry(
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__field( unsigned long, nr_reclaimed )
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),
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TP_fast_assign(
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__entry->nr_reclaimed = nr_reclaimed;
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),
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TP_printk("nr_reclaimed=%lu", __entry->nr_reclaimed)
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);
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DEFINE_EVENT(mm_vmscan_direct_reclaim_end_template, mm_vmscan_direct_reclaim_end,
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TP_PROTO(unsigned long nr_reclaimed),
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TP_ARGS(nr_reclaimed)
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);
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#ifdef CONFIG_MEMCG
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DEFINE_EVENT(mm_vmscan_direct_reclaim_end_template, mm_vmscan_memcg_reclaim_end,
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TP_PROTO(unsigned long nr_reclaimed),
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TP_ARGS(nr_reclaimed)
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);
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DEFINE_EVENT(mm_vmscan_direct_reclaim_end_template, mm_vmscan_memcg_softlimit_reclaim_end,
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TP_PROTO(unsigned long nr_reclaimed),
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TP_ARGS(nr_reclaimed)
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);
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#endif /* CONFIG_MEMCG */
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TRACE_EVENT(mm_shrink_slab_start,
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TP_PROTO(struct shrinker *shr, struct shrink_control *sc,
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long nr_objects_to_shrink, unsigned long cache_items,
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unsigned long long delta, unsigned long total_scan,
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int priority),
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TP_ARGS(shr, sc, nr_objects_to_shrink, cache_items, delta, total_scan,
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priority),
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TP_STRUCT__entry(
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__field(struct shrinker *, shr)
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__field(void *, shrink)
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__field(int, nid)
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__field(long, nr_objects_to_shrink)
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__field(gfp_t, gfp_flags)
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__field(unsigned long, cache_items)
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__field(unsigned long long, delta)
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__field(unsigned long, total_scan)
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__field(int, priority)
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),
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TP_fast_assign(
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__entry->shr = shr;
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__entry->shrink = shr->scan_objects;
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__entry->nid = sc->nid;
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__entry->nr_objects_to_shrink = nr_objects_to_shrink;
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__entry->gfp_flags = sc->gfp_mask;
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__entry->cache_items = cache_items;
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__entry->delta = delta;
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__entry->total_scan = total_scan;
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__entry->priority = priority;
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),
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TP_printk("%pS %p: nid: %d objects to shrink %ld gfp_flags %s cache items %ld delta %lld total_scan %ld priority %d",
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__entry->shrink,
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__entry->shr,
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__entry->nid,
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__entry->nr_objects_to_shrink,
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show_gfp_flags(__entry->gfp_flags),
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__entry->cache_items,
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__entry->delta,
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__entry->total_scan,
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__entry->priority)
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);
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TRACE_EVENT(mm_shrink_slab_end,
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TP_PROTO(struct shrinker *shr, int nid, int shrinker_retval,
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long unused_scan_cnt, long new_scan_cnt, long total_scan),
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TP_ARGS(shr, nid, shrinker_retval, unused_scan_cnt, new_scan_cnt,
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total_scan),
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TP_STRUCT__entry(
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__field(struct shrinker *, shr)
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__field(int, nid)
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__field(void *, shrink)
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__field(long, unused_scan)
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__field(long, new_scan)
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__field(int, retval)
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__field(long, total_scan)
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),
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TP_fast_assign(
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__entry->shr = shr;
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__entry->nid = nid;
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__entry->shrink = shr->scan_objects;
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__entry->unused_scan = unused_scan_cnt;
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__entry->new_scan = new_scan_cnt;
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__entry->retval = shrinker_retval;
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__entry->total_scan = total_scan;
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),
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TP_printk("%pS %p: nid: %d unused scan count %ld new scan count %ld total_scan %ld last shrinker return val %d",
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__entry->shrink,
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__entry->shr,
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__entry->nid,
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__entry->unused_scan,
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__entry->new_scan,
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__entry->total_scan,
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__entry->retval)
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);
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TRACE_EVENT(mm_vmscan_lru_isolate,
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TP_PROTO(int highest_zoneidx,
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int order,
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unsigned long nr_requested,
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unsigned long nr_scanned,
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unsigned long nr_skipped,
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unsigned long nr_taken,
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isolate_mode_t isolate_mode,
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int lru),
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TP_ARGS(highest_zoneidx, order, nr_requested, nr_scanned, nr_skipped, nr_taken, isolate_mode, lru),
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TP_STRUCT__entry(
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__field(int, highest_zoneidx)
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__field(int, order)
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__field(unsigned long, nr_requested)
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__field(unsigned long, nr_scanned)
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__field(unsigned long, nr_skipped)
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__field(unsigned long, nr_taken)
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__field(isolate_mode_t, isolate_mode)
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__field(int, lru)
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),
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TP_fast_assign(
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__entry->highest_zoneidx = highest_zoneidx;
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__entry->order = order;
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__entry->nr_requested = nr_requested;
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__entry->nr_scanned = nr_scanned;
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__entry->nr_skipped = nr_skipped;
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__entry->nr_taken = nr_taken;
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__entry->isolate_mode = isolate_mode;
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__entry->lru = lru;
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),
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/*
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* classzone is previous name of the highest_zoneidx.
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* Reason not to change it is the ABI requirement of the tracepoint.
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*/
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TP_printk("isolate_mode=%d classzone=%d order=%d nr_requested=%lu nr_scanned=%lu nr_skipped=%lu nr_taken=%lu lru=%s",
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__entry->isolate_mode,
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__entry->highest_zoneidx,
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__entry->order,
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__entry->nr_requested,
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__entry->nr_scanned,
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__entry->nr_skipped,
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__entry->nr_taken,
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__print_symbolic(__entry->lru, LRU_NAMES))
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);
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TRACE_EVENT(mm_vmscan_writepage,
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TP_PROTO(struct page *page),
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TP_ARGS(page),
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TP_STRUCT__entry(
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__field(unsigned long, pfn)
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__field(int, reclaim_flags)
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),
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TP_fast_assign(
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__entry->pfn = page_to_pfn(page);
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__entry->reclaim_flags = trace_reclaim_flags(
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page_is_file_lru(page));
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),
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TP_printk("page=%p pfn=0x%lx flags=%s",
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pfn_to_page(__entry->pfn),
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__entry->pfn,
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show_reclaim_flags(__entry->reclaim_flags))
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);
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TRACE_EVENT(mm_vmscan_lru_shrink_inactive,
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TP_PROTO(int nid,
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unsigned long nr_scanned, unsigned long nr_reclaimed,
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struct reclaim_stat *stat, int priority, int file),
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TP_ARGS(nid, nr_scanned, nr_reclaimed, stat, priority, file),
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TP_STRUCT__entry(
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__field(int, nid)
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__field(unsigned long, nr_scanned)
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__field(unsigned long, nr_reclaimed)
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__field(unsigned long, nr_dirty)
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__field(unsigned long, nr_writeback)
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__field(unsigned long, nr_congested)
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__field(unsigned long, nr_immediate)
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__field(unsigned int, nr_activate0)
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__field(unsigned int, nr_activate1)
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__field(unsigned long, nr_ref_keep)
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__field(unsigned long, nr_unmap_fail)
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__field(int, priority)
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__field(int, reclaim_flags)
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),
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TP_fast_assign(
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__entry->nid = nid;
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__entry->nr_scanned = nr_scanned;
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__entry->nr_reclaimed = nr_reclaimed;
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__entry->nr_dirty = stat->nr_dirty;
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__entry->nr_writeback = stat->nr_writeback;
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__entry->nr_congested = stat->nr_congested;
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__entry->nr_immediate = stat->nr_immediate;
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__entry->nr_activate0 = stat->nr_activate[0];
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__entry->nr_activate1 = stat->nr_activate[1];
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__entry->nr_ref_keep = stat->nr_ref_keep;
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__entry->nr_unmap_fail = stat->nr_unmap_fail;
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__entry->priority = priority;
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__entry->reclaim_flags = trace_reclaim_flags(file);
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),
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TP_printk("nid=%d nr_scanned=%ld nr_reclaimed=%ld nr_dirty=%ld nr_writeback=%ld nr_congested=%ld nr_immediate=%ld nr_activate_anon=%d nr_activate_file=%d nr_ref_keep=%ld nr_unmap_fail=%ld priority=%d flags=%s",
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__entry->nid,
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__entry->nr_scanned, __entry->nr_reclaimed,
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__entry->nr_dirty, __entry->nr_writeback,
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__entry->nr_congested, __entry->nr_immediate,
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__entry->nr_activate0, __entry->nr_activate1,
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__entry->nr_ref_keep, __entry->nr_unmap_fail,
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__entry->priority,
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show_reclaim_flags(__entry->reclaim_flags))
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);
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TRACE_EVENT(mm_vmscan_lru_shrink_active,
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TP_PROTO(int nid, unsigned long nr_taken,
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unsigned long nr_active, unsigned long nr_deactivated,
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unsigned long nr_referenced, int priority, int file),
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TP_ARGS(nid, nr_taken, nr_active, nr_deactivated, nr_referenced, priority, file),
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TP_STRUCT__entry(
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__field(int, nid)
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__field(unsigned long, nr_taken)
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__field(unsigned long, nr_active)
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__field(unsigned long, nr_deactivated)
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__field(unsigned long, nr_referenced)
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__field(int, priority)
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__field(int, reclaim_flags)
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),
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TP_fast_assign(
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__entry->nid = nid;
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__entry->nr_taken = nr_taken;
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__entry->nr_active = nr_active;
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__entry->nr_deactivated = nr_deactivated;
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__entry->nr_referenced = nr_referenced;
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__entry->priority = priority;
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__entry->reclaim_flags = trace_reclaim_flags(file);
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),
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TP_printk("nid=%d nr_taken=%ld nr_active=%ld nr_deactivated=%ld nr_referenced=%ld priority=%d flags=%s",
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__entry->nid,
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__entry->nr_taken,
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__entry->nr_active, __entry->nr_deactivated, __entry->nr_referenced,
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__entry->priority,
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show_reclaim_flags(__entry->reclaim_flags))
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);
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TRACE_EVENT(mm_vmscan_node_reclaim_begin,
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TP_PROTO(int nid, int order, gfp_t gfp_flags),
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TP_ARGS(nid, order, gfp_flags),
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TP_STRUCT__entry(
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__field(int, nid)
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__field(int, order)
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__field(gfp_t, gfp_flags)
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),
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TP_fast_assign(
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__entry->nid = nid;
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__entry->order = order;
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__entry->gfp_flags = gfp_flags;
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),
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TP_printk("nid=%d order=%d gfp_flags=%s",
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__entry->nid,
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__entry->order,
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show_gfp_flags(__entry->gfp_flags))
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);
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DEFINE_EVENT(mm_vmscan_direct_reclaim_end_template, mm_vmscan_node_reclaim_end,
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TP_PROTO(unsigned long nr_reclaimed),
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TP_ARGS(nr_reclaimed)
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);
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TRACE_EVENT(mm_vmscan_throttled,
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|
TP_PROTO(int nid, int usec_timeout, int usec_delayed, int reason),
|
|
|
|
TP_ARGS(nid, usec_timeout, usec_delayed, reason),
|
|
|
|
TP_STRUCT__entry(
|
|
__field(int, nid)
|
|
__field(int, usec_timeout)
|
|
__field(int, usec_delayed)
|
|
__field(int, reason)
|
|
),
|
|
|
|
TP_fast_assign(
|
|
__entry->nid = nid;
|
|
__entry->usec_timeout = usec_timeout;
|
|
__entry->usec_delayed = usec_delayed;
|
|
__entry->reason = 1U << reason;
|
|
),
|
|
|
|
TP_printk("nid=%d usec_timeout=%d usect_delayed=%d reason=%s",
|
|
__entry->nid,
|
|
__entry->usec_timeout,
|
|
__entry->usec_delayed,
|
|
show_throttle_flags(__entry->reason))
|
|
);
|
|
#endif /* _TRACE_VMSCAN_H */
|
|
|
|
/* This part must be outside protection */
|
|
#include <trace/define_trace.h>
|