9caa3b38bb
With this patch, anon pages of inactive tasks can be reclaimed, depending on memory pressure. Memory pressure is detected using vmpressure events. 'N' best tasks in terms of anon size is selected and pages proportional to their tasksize is reclaimed. The total number of pages reclaimed at each run of the swap work, can be tuned from userspace, the default being SWAP_CLUSTER_MAX * 32. The patch also adds tracepoints to debug and tune the feature. echo 1 > /sys/module/process_reclaim/parameters/enable_process_reclaim to enable the feature. echo <pages> > /sys/module/process_reclaim/parameters/per_swap_size, to set the number of pages reclaimed in each scan. /sys/module/process_reclaim/parameters/reclaim_avg_efficiency, provides the average efficiency (scan to reclaim ratio) of the algorithm. /sys/module/process_reclaim/parameters/swap_eff_win, to set the window period (in unit of number of times reclaim is triggered) to detect low efficiency runs. /sys/module/process_reclaim/parameters/swap_opt_eff, to set the optimal efficiency threshold for low efficiency detection. Change-Id: I895986f10c997d1715761eaaadc4bbbee60db9d2 Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>
85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM process_reclaim
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#if !defined(_TRACE_EVENT_PROCESSRECLAIM_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_EVENT_PROCESSRECLAIM_H
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#include <linux/tracepoint.h>
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#include <linux/types.h>
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#include <linux/sched.h>
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TRACE_EVENT(process_reclaim,
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TP_PROTO(int tasksize,
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short oom_score_adj,
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int nr_scanned, int nr_reclaimed,
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int per_swap_size, int total_sz,
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int nr_to_reclaim),
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TP_ARGS(tasksize, oom_score_adj, nr_scanned,
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nr_reclaimed, per_swap_size,
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total_sz, nr_to_reclaim),
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TP_STRUCT__entry(
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__field(int, tasksize)
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__field(short, oom_score_adj)
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__field(int, nr_scanned)
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__field(int, nr_reclaimed)
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__field(int, per_swap_size)
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__field(int, total_sz)
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__field(int, nr_to_reclaim)
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),
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TP_fast_assign(
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__entry->tasksize = tasksize;
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__entry->oom_score_adj = oom_score_adj;
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__entry->nr_scanned = nr_scanned;
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__entry->nr_reclaimed = nr_reclaimed;
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__entry->per_swap_size = per_swap_size;
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__entry->total_sz = total_sz;
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__entry->nr_to_reclaim = nr_to_reclaim;
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),
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TP_printk("%d, %hd, %d, %d, %d, %d, %d",
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__entry->tasksize, __entry->oom_score_adj,
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__entry->nr_scanned, __entry->nr_reclaimed,
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__entry->per_swap_size, __entry->total_sz,
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__entry->nr_to_reclaim)
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);
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TRACE_EVENT(process_reclaim_eff,
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TP_PROTO(int efficiency, int reclaim_avg_efficiency),
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TP_ARGS(efficiency, reclaim_avg_efficiency),
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TP_STRUCT__entry(
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__field(int, efficiency)
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__field(int, reclaim_avg_efficiency)
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),
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TP_fast_assign(
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__entry->efficiency = efficiency;
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__entry->reclaim_avg_efficiency = reclaim_avg_efficiency;
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),
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TP_printk("%d, %d", __entry->efficiency,
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__entry->reclaim_avg_efficiency)
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);
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#endif
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#include <trace/define_trace.h>
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