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[2003:cb:c713:2a00:f151:50f1:7164:32e6]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-36d2724c654sm2692884f8f.115.2024.08.08.11.20.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 08 Aug 2024 11:20:15 -0700 (PDT) Message-ID: <9cf6cbc1-67c0-4ae5-ae5e-5033631e61b6@redhat.com> Date: Thu, 8 Aug 2024 20:20:13 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 3/4] mm: add system wide stats items category To: Pasha Tatashin , akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-cxl@vger.kernel.org, cerasuolodomenico@gmail.com, hannes@cmpxchg.org, j.granados@samsung.com, lizhijian@fujitsu.com, muchun.song@linux.dev, nphamcs@gmail.com, rientjes@google.com, rppt@kernel.org, souravpanda@google.com, vbabka@suse.cz, willy@infradead.org, dan.j.williams@intel.com, yi.zhang@redhat.com, alison.schofield@intel.com, yosryahmed@google.com References: <20240808154237.220029-1-pasha.tatashin@soleen.com> <20240808154237.220029-4-pasha.tatashin@soleen.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 43E44C0015 X-Stat-Signature: 4tugpde4phnkmngdem3s3nrkoeddeprf X-Rspam-User: X-HE-Tag: 1723141219-582088 X-HE-Meta: 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 mLqDLPxp LZb159NA+cKINZ0XuKiKP1IAT6cvDMCy2Akc0GYff4nhtE9abtwB6iIDbUHgSAoAkwQuigKCr0b6HNG7gS5/F51EEiRh9+NSAYTgNZeM/mDpY4Bwul/CL63XHAxRmt2kelj9iDR2wgkb+OBUkqW2mAGMS89VZ7hhXgJ7myxv/tgALAz9HmCBW2g3A4ZL79aePhsrtcpWAby7qJ7jeNAVYuBAIOB3w4dqYn4JjiTxCnubU9CeOEOR+AphRy0qxJMKMq2PVx39K4W39Ut7SoG0/dHzyxWRl1iCaTOBsTAoI8Vbs9pnHin7o9L6mdMKIPtDO0YB3jVdVctCgAx2jKblbvSVst+d4ub3/vwXoUNWAGqCuNhi98NZPA4N2yWQpRWgi88ark7wTmxf37zt8WE0rZCjS2A== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 08.08.24 17:42, Pasha Tatashin wrote: > /proc/vmstat contains events and stats, events can only grow, but stats > can grow and srhink. s/shrink/ I think we discussed exposing this in /proc/meminfo. There, it would be much easier to simply have a global variable, print it, and be done with it. Like we do with TotalCma. For /proc/vmstat that's likely the right approach what you have here. > > vmstat has the following: > ------------------------- > NR_VM_ZONE_STAT_ITEMS: per-zone stats > NR_VM_NUMA_EVENT_ITEMS: per-numa events > NR_VM_NODE_STAT_ITEMS: per-numa stats > NR_VM_WRITEBACK_STAT_ITEMS: system-wide background-writeback and > dirty-throttling tresholds. > NR_VM_EVENT_ITEMS: system-wide events > ------------------------- > > Rename NR_VM_WRITEBACK_STAT_ITEMS to NR_VM_STAT_ITEMS, to track the > system-wide stats, we are going to add per-page metadata stats to this > category in the next patch. > > Also delete unused writeback_stat_name() function. > > Suggested-by: Yosry Ahmed > Signed-off-by: Pasha Tatashin > --- > include/linux/vmstat.h | 15 ++++----------- > mm/vmstat.c | 6 +++--- > 2 files changed, 7 insertions(+), 14 deletions(-) > > diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h > index 23cd17942036..9ab4fa5e09b5 100644 > --- a/include/linux/vmstat.h > +++ b/include/linux/vmstat.h > @@ -34,10 +34,11 @@ struct reclaim_stat { > unsigned nr_lazyfree_fail; > }; > > -enum writeback_stat_item { > +/* Stat data for system wide items */ > +enum vm_stat_item { > NR_DIRTY_THRESHOLD, > NR_DIRTY_BG_THRESHOLD, > - NR_VM_WRITEBACK_STAT_ITEMS, > + NR_VM_STAT_ITEMS, > }; > > #ifdef CONFIG_VM_EVENT_COUNTERS > @@ -514,21 +515,13 @@ static inline const char *lru_list_name(enum lru_list lru) > return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_" > } > > -static inline const char *writeback_stat_name(enum writeback_stat_item item) > -{ > - return vmstat_text[NR_VM_ZONE_STAT_ITEMS + > - NR_VM_NUMA_EVENT_ITEMS + > - NR_VM_NODE_STAT_ITEMS + > - item]; > -} > - > #if defined(CONFIG_VM_EVENT_COUNTERS) || defined(CONFIG_MEMCG) > static inline const char *vm_event_name(enum vm_event_item item) > { > return vmstat_text[NR_VM_ZONE_STAT_ITEMS + > NR_VM_NUMA_EVENT_ITEMS + > NR_VM_NODE_STAT_ITEMS + > - NR_VM_WRITEBACK_STAT_ITEMS + > + NR_VM_STAT_ITEMS + > item]; > } > #endif /* CONFIG_VM_EVENT_COUNTERS || CONFIG_MEMCG */ > diff --git a/mm/vmstat.c b/mm/vmstat.c > index 04a1cb6cc636..6f8aa4766f16 100644 > --- a/mm/vmstat.c > +++ b/mm/vmstat.c > @@ -1257,7 +1257,7 @@ const char * const vmstat_text[] = { > "pgdemote_khugepaged", > "nr_memmap", > "nr_memmap_boot", > - /* enum writeback_stat_item counters */ > + /* system-wide enum vm_stat_item counters */ > "nr_dirty_threshold", > "nr_dirty_background_threshold", > > @@ -1790,7 +1790,7 @@ static const struct seq_operations zoneinfo_op = { > #define NR_VMSTAT_ITEMS (NR_VM_ZONE_STAT_ITEMS + \ > NR_VM_NUMA_EVENT_ITEMS + \ > NR_VM_NODE_STAT_ITEMS + \ > - NR_VM_WRITEBACK_STAT_ITEMS + \ > + NR_VM_STAT_ITEMS + \ > (IS_ENABLED(CONFIG_VM_EVENT_COUNTERS) ? \ > NR_VM_EVENT_ITEMS : 0)) > > @@ -1827,7 +1827,7 @@ static void *vmstat_start(struct seq_file *m, loff_t *pos) > > global_dirty_limits(v + NR_DIRTY_BG_THRESHOLD, > v + NR_DIRTY_THRESHOLD); > - v += NR_VM_WRITEBACK_STAT_ITEMS; > + v += NR_VM_STAT_ITEMS; > > #ifdef CONFIG_VM_EVENT_COUNTERS > all_vm_events(v); -- Cheers, David / dhildenb