From patchwork Thu Oct 31 23:46:03 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dave Chinner X-Patchwork-Id: 11222189 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C078314E5 for ; Thu, 31 Oct 2019 23:48:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9DCB5208C0 for ; Thu, 31 Oct 2019 23:48:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729711AbfJaXsU (ORCPT ); Thu, 31 Oct 2019 19:48:20 -0400 Received: from mail104.syd.optusnet.com.au ([211.29.132.246]:40223 "EHLO mail104.syd.optusnet.com.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728397AbfJaXq2 (ORCPT ); Thu, 31 Oct 2019 19:46:28 -0400 Received: from dread.disaster.area (pa49-180-67-183.pa.nsw.optusnet.com.au [49.180.67.183]) by mail104.syd.optusnet.com.au (Postfix) with ESMTPS id E37D17EA89D; Fri, 1 Nov 2019 10:46:24 +1100 (AEDT) Received: from discord.disaster.area ([192.168.253.110]) by dread.disaster.area with esmtp (Exim 4.92.3) (envelope-from ) id 1iQK8x-0007CK-Ee; Fri, 01 Nov 2019 10:46:19 +1100 Received: from dave by discord.disaster.area with local (Exim 4.92.3) (envelope-from ) id 1iQK8x-00041m-CB; Fri, 01 Nov 2019 10:46:19 +1100 From: Dave Chinner To: linux-xfs@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH 13/28] shrinker: clean up variable types and tracepoints Date: Fri, 1 Nov 2019 10:46:03 +1100 Message-Id: <20191031234618.15403-14-david@fromorbit.com> X-Mailer: git-send-email 2.24.0.rc0 In-Reply-To: <20191031234618.15403-1-david@fromorbit.com> References: <20191031234618.15403-1-david@fromorbit.com> MIME-Version: 1.0 X-Optus-CM-Score: 0 X-Optus-CM-Analysis: v=2.2 cv=D+Q3ErZj c=1 sm=1 tr=0 a=3wLbm4YUAFX2xaPZIabsgw==:117 a=3wLbm4YUAFX2xaPZIabsgw==:17 a=jpOVt7BSZ2e4Z31A5e1TngXxSK0=:19 a=MeAgGD-zjQ4A:10 a=20KFwNOVAAAA:8 a=dfQxWFgAP5TgkvwPFjsA:9 Sender: linux-xfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org From: Dave Chinner The tracepoint information in the shrinker code don't make a lot of sense anymore and contain redundant information as a result of the changes in the patchset. Refine the information passed to the tracepoints so they expose the operation of the shrinkers more precisely and clean up the remaining code and varibles in the shrinker code so it all makes sense. Signed-off-by: Dave Chinner Reviewed-by: Brian Foster --- include/trace/events/vmscan.h | 69 ++++++++++++++++------------------- mm/vmscan.c | 24 +++++------- 2 files changed, 41 insertions(+), 52 deletions(-) diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h index a5ab2973e8dc..110637d9efa5 100644 --- a/include/trace/events/vmscan.h +++ b/include/trace/events/vmscan.h @@ -184,84 +184,77 @@ DEFINE_EVENT(mm_vmscan_direct_reclaim_end_template, mm_vmscan_memcg_softlimit_re TRACE_EVENT(mm_shrink_slab_start, TP_PROTO(struct shrinker *shr, struct shrink_control *sc, - long nr_objects_to_shrink, unsigned long cache_items, - unsigned long long delta, unsigned long total_scan, - int priority), + int64_t deferred_count, int64_t freeable_objects, + int64_t scan_count, int priority), - TP_ARGS(shr, sc, nr_objects_to_shrink, cache_items, delta, total_scan, + TP_ARGS(shr, sc, deferred_count, freeable_objects, scan_count, priority), TP_STRUCT__entry( __field(struct shrinker *, shr) __field(void *, shrink) __field(int, nid) - __field(long, nr_objects_to_shrink) - __field(gfp_t, gfp_flags) - __field(unsigned long, cache_items) - __field(unsigned long long, delta) - __field(unsigned long, total_scan) + __field(int64_t, deferred_count) + __field(int64_t, freeable_objects) + __field(int64_t, scan_count) __field(int, priority) + __field(gfp_t, gfp_flags) ), TP_fast_assign( __entry->shr = shr; __entry->shrink = shr->scan_objects; __entry->nid = sc->nid; - __entry->nr_objects_to_shrink = nr_objects_to_shrink; - __entry->gfp_flags = sc->gfp_mask; - __entry->cache_items = cache_items; - __entry->delta = delta; - __entry->total_scan = total_scan; + __entry->deferred_count = deferred_count; + __entry->freeable_objects = freeable_objects; + __entry->scan_count = scan_count; __entry->priority = priority; + __entry->gfp_flags = sc->gfp_mask; ), - TP_printk("%pS %p: nid: %d objects to shrink %ld gfp_flags %s cache items %ld delta %lld total_scan %ld priority %d", + TP_printk("%pS %p: nid: %d scan count %lld freeable items %lld deferred count %lld priority %d gfp_flags %s", __entry->shrink, __entry->shr, __entry->nid, - __entry->nr_objects_to_shrink, - show_gfp_flags(__entry->gfp_flags), - __entry->cache_items, - __entry->delta, - __entry->total_scan, - __entry->priority) + __entry->scan_count, + __entry->freeable_objects, + __entry->deferred_count, + __entry->priority, + show_gfp_flags(__entry->gfp_flags)) ); TRACE_EVENT(mm_shrink_slab_end, - TP_PROTO(struct shrinker *shr, int nid, int shrinker_retval, - long unused_scan_cnt, long new_scan_cnt, long total_scan), + TP_PROTO(struct shrinker *shr, int nid, int64_t freed_objects, + int64_t scanned_objects, int64_t deferred_scan), - TP_ARGS(shr, nid, shrinker_retval, unused_scan_cnt, new_scan_cnt, - total_scan), + TP_ARGS(shr, nid, freed_objects, scanned_objects, + deferred_scan), TP_STRUCT__entry( __field(struct shrinker *, shr) __field(int, nid) __field(void *, shrink) - __field(long, unused_scan) - __field(long, new_scan) - __field(int, retval) - __field(long, total_scan) + __field(long long, freed_objects) + __field(long long, scanned_objects) + __field(long long, deferred_scan) ), TP_fast_assign( __entry->shr = shr; __entry->nid = nid; __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; + __entry->freed_objects = freed_objects; + __entry->scanned_objects = scanned_objects; + __entry->deferred_scan = deferred_scan; ), - TP_printk("%pS %p: nid: %d unused scan count %ld new scan count %ld total_scan %ld last shrinker return val %d", + TP_printk("%pS %p: nid: %d freed objects %lld scanned objects %lld, deferred scan %lld", __entry->shrink, __entry->shr, __entry->nid, - __entry->unused_scan, - __entry->new_scan, - __entry->total_scan, - __entry->retval) + __entry->freed_objects, + __entry->scanned_objects, + __entry->deferred_scan) ); TRACE_EVENT(mm_vmscan_lru_isolate, diff --git a/mm/vmscan.c b/mm/vmscan.c index c0e2bf656e3f..7a8256322150 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -523,7 +523,6 @@ static unsigned long do_shrink_slab(struct shrink_control *shrinkctl, int64_t scanned_objects = 0; int64_t next_deferred = 0; int64_t deferred_count = 0; - int64_t new_nr; int nid = shrinkctl->nid; long batch_size = shrinker->batch ? shrinker->batch : SHRINK_BATCH; @@ -580,8 +579,7 @@ static unsigned long do_shrink_slab(struct shrink_control *shrinkctl, scan_count = min(scan_count, freeable_objects * 2); trace_mm_shrink_slab_start(shrinker, shrinkctl, deferred_count, - freeable_objects, scan_count, - scan_count, priority); + freeable_objects, scan_count, priority); /* * If the shrinker can't run (e.g. due to gfp_mask constraints), then @@ -624,23 +622,21 @@ static unsigned long do_shrink_slab(struct shrink_control *shrinkctl, cond_resched(); } done: + /* + * Calculate the remaining work that we need to defer to kswapd, and + * store it in a manner that handles concurrent updates. If we exhausted + * the scan, there is no need to do an update. + */ if (deferred_count) next_deferred = deferred_count - scanned_objects; else next_deferred = scan_count; - /* - * move the unused scan count back into the shrinker in a - * manner that handles concurrent updates. If we exhausted the - * scan, there is no need to do an update. - */ + if (next_deferred > 0) - new_nr = atomic64_add_return(next_deferred, - &shrinker->nr_deferred[nid]); - else - new_nr = atomic64_read(&shrinker->nr_deferred[nid]); + atomic64_add(next_deferred, &shrinker->nr_deferred[nid]); - trace_mm_shrink_slab_end(shrinker, nid, freed, deferred_count, new_nr, - scan_count); + trace_mm_shrink_slab_end(shrinker, nid, freed, scanned_objects, + next_deferred); return freed; }