From patchwork Wed Oct 9 03:21:10 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dave Chinner X-Patchwork-Id: 11180419 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 EBBFC76 for ; Wed, 9 Oct 2019 03:36:48 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B9E1D21835 for ; Wed, 9 Oct 2019 03:36:48 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B9E1D21835 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=fromorbit.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id DA8BD8E001C; Tue, 8 Oct 2019 23:36:46 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id D59B88E0016; Tue, 8 Oct 2019 23:36:46 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C6F3C8E001C; Tue, 8 Oct 2019 23:36:46 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0136.hostedemail.com [216.40.44.136]) by kanga.kvack.org (Postfix) with ESMTP id 94A108E0016 for ; Tue, 8 Oct 2019 23:36:46 -0400 (EDT) Received: from smtpin15.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with SMTP id 3CE2D180AD803 for ; Wed, 9 Oct 2019 03:36:46 +0000 (UTC) X-FDA: 76022834412.15.pail87_1de86187c7f5a X-Spam-Summary: 2,0,0,29e6ee2100cd0331,d41d8cd98f00b204,david@fromorbit.com,:linux-xfs@vger.kernel.org::linux-fsdevel@vger.kernel.org,RULES_HIT:2:41:69:355:379:541:800:960:966:973:988:989:1260:1261:1311:1314:1345:1359:1437:1515:1535:1605:1730:1747:1777:1792:2196:2198:2199:2200:2393:2559:2562:2892:2895:3138:3139:3140:3141:3142:3865:3866:3867:3868:3870:3871:3872:3874:4049:4119:4321:4385:4605:5007:6119:6261:7576:7875:10004:10128:11026:11232:11658:11914:12043:12296:12297:12438:12517:12519:12555:12679:12683:12895:13161:13229:13894:14394:14877:21080:21451:21627:21740:30012:30054:30070:30075,0,RBL:211.29.132.249:@fromorbit.com:.lbl8.mailshell.net-62.8.32.100 66.201.201.201,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:24,LUA_SUMMARY:none X-HE-Tag: pail87_1de86187c7f5a X-Filterd-Recvd-Size: 8250 Received: from mail105.syd.optusnet.com.au (mail105.syd.optusnet.com.au [211.29.132.249]) by imf37.hostedemail.com (Postfix) with ESMTP for ; Wed, 9 Oct 2019 03:36:45 +0000 (UTC) Received: from dread.disaster.area (pa49-181-226-196.pa.nsw.optusnet.com.au [49.181.226.196]) by mail105.syd.optusnet.com.au (Postfix) with ESMTPS id 4B476363A60 for ; Wed, 9 Oct 2019 14:36:44 +1100 (AEDT) Received: from discord.disaster.area ([192.168.253.110]) by dread.disaster.area with esmtp (Exim 4.92.2) (envelope-from ) id 1iI2XX-0006Bb-1p; Wed, 09 Oct 2019 14:21:27 +1100 Received: from dave by discord.disaster.area with local (Exim 4.92) (envelope-from ) id 1iI2XW-00039T-Vy; Wed, 09 Oct 2019 14:21:26 +1100 From: Dave Chinner To: linux-xfs@vger.kernel.org Cc: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 12/26] shrinker: clean up variable types and tracepoints Date: Wed, 9 Oct 2019 14:21:10 +1100 Message-Id: <20191009032124.10541-13-david@fromorbit.com> X-Mailer: git-send-email 2.23.0.rc1 In-Reply-To: <20191009032124.10541-1-david@fromorbit.com> References: <20191009032124.10541-1-david@fromorbit.com> MIME-Version: 1.0 X-Optus-CM-Score: 0 X-Optus-CM-Analysis: v=2.2 cv=P6RKvmIu c=1 sm=1 tr=0 a=dRuLqZ1tmBNts2YiI0zFQg==:117 a=dRuLqZ1tmBNts2YiI0zFQg==:17 a=jpOVt7BSZ2e4Z31A5e1TngXxSK0=:19 a=XobE76Q3jBoA:10 a=20KFwNOVAAAA:8 a=dfQxWFgAP5TgkvwPFjsA:9 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000008, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 --- 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 d05f64bd26ff..65093dd89dd7 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -522,7 +522,6 @@ 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; @@ -579,8 +578,7 @@ 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 @@ -623,23 +621,21 @@ 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; }