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Mon, 30 Aug 2021 11:50:02 -0700 (PDT) Received: from google.com ([2620:15c:211:201:68f5:6f6:b355:2de8]) by smtp.gmail.com with ESMTPSA id gc20sm199846pjb.17.2021.08.30.11.50.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 Aug 2021 11:50:01 -0700 (PDT) Date: Mon, 30 Aug 2021 11:49:59 -0700 From: Minchan Kim To: Johannes Weiner Cc: Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@fb.com Subject: Re: [PATCH 4/4] mm: zswap: add basic meminfo and vmstat coverage Message-ID: References: <20210819195533.211756-1-hannes@cmpxchg.org> <20210819195533.211756-4-hannes@cmpxchg.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210819195533.211756-4-hannes@cmpxchg.org> X-Rspamd-Queue-Id: 3387C1021634 Authentication-Results: imf13.hostedemail.com; dkim=pass header.d=gmail.com header.s=20161025 header.b=T0aLe5J4; dmarc=fail reason="SPF not aligned (relaxed), DKIM not aligned (relaxed)" header.from=kernel.org (policy=none); spf=pass (imf13.hostedemail.com: domain of minchankim@gmail.com designates 209.85.214.172 as permitted sender) smtp.mailfrom=minchankim@gmail.com X-Rspamd-Server: rspam01 X-Stat-Signature: r5x4dazinp7aopo9fdfepjg63r3stg87 X-HE-Tag: 1630349403-582657 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: Hi Johannes, On Thu, Aug 19, 2021 at 03:55:33PM -0400, Johannes Weiner wrote: > Currently it requires poking at debugfs to figure out the size of the > zswap cache size on a host. There are no counters for reads and writes > against the cache. This makes it difficult to understand behavior on > production systems. > > Print zswap memory consumption in /proc/meminfo, count zswapouts and > zswapins in /proc/vmstat. > > Signed-off-by: Johannes Weiner > --- > fs/proc/meminfo.c | 4 ++++ > include/linux/swap.h | 4 ++++ > include/linux/vm_event_item.h | 4 ++++ > mm/vmstat.c | 4 ++++ > mm/zswap.c | 11 +++++------ > 5 files changed, 21 insertions(+), 6 deletions(-) > > diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c > index 6fa761c9cc78..2dc474940691 100644 > --- a/fs/proc/meminfo.c > +++ b/fs/proc/meminfo.c > @@ -86,6 +86,10 @@ static int meminfo_proc_show(struct seq_file *m, void *v) > > show_val_kb(m, "SwapTotal: ", i.totalswap); > show_val_kb(m, "SwapFree: ", i.freeswap); > +#ifdef CONFIG_ZSWAP > + seq_printf(m, "Zswap: %8lu kB\n", > + (unsigned long)(zswap_pool_total_size >> 10)); Since we have zram as well as zswap, it would be great if we can abstract both at once without introducing another "Zram: " stuff in meminfo. A note: zram can support fs based on on zram blk device as well as swap. Thus, term would be better to say "compressed" rather than "swap". How about this? "Compressed: xx kB" unsigined long total_compressed_memory(void) { return zswap_compressed_mem() + zram_comporessed_mem(); } > +#endif > show_val_kb(m, "Dirty: ", > global_node_page_state(NR_FILE_DIRTY)); > show_val_kb(m, "Writeback: ", > diff --git a/include/linux/swap.h b/include/linux/swap.h > index 144727041e78..3b23c88b6a8d 100644 > --- a/include/linux/swap.h > +++ b/include/linux/swap.h > @@ -696,6 +696,10 @@ static inline int mem_cgroup_swappiness(struct mem_cgroup *mem) > } > #endif > > +#ifdef CONFIG_ZSWAP > +extern u64 zswap_pool_total_size; > +#endif > + > #if defined(CONFIG_SWAP) && defined(CONFIG_MEMCG) && defined(CONFIG_BLK_CGROUP) > extern void cgroup_throttle_swaprate(struct page *page, gfp_t gfp_mask); > #else > diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h > index ae0dd1948c2b..9dbebea09c69 100644 > --- a/include/linux/vm_event_item.h > +++ b/include/linux/vm_event_item.h > @@ -125,6 +125,10 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT, > SWAP_RA, > SWAP_RA_HIT, > #endif > +#ifdef CONFIG_ZSWAP > + ZSWPIN, > + ZSWPOUT, INMEM_SWP[IN|OUT] to represent both zram and zswap ? Feel free to suggest better word. > +#endif > #ifdef CONFIG_X86 > DIRECT_MAP_LEVEL2_SPLIT, > DIRECT_MAP_LEVEL3_SPLIT, > diff --git a/mm/vmstat.c b/mm/vmstat.c > index cccee36b289c..31aada15c571 100644 > --- a/mm/vmstat.c > +++ b/mm/vmstat.c > @@ -1369,6 +1369,10 @@ const char * const vmstat_text[] = { > "swap_ra", > "swap_ra_hit", > #endif > +#ifdef CONFIG_ZSWAP > + "zswpin", > + "zswpout", > +#endif > #ifdef CONFIG_X86 > "direct_map_level2_splits", > "direct_map_level3_splits", > diff --git a/mm/zswap.c b/mm/zswap.c > index 20763267a219..f93a7c715f76 100644 > --- a/mm/zswap.c > +++ b/mm/zswap.c > @@ -40,7 +40,7 @@ > * statistics > **********************************/ > /* Total bytes used by the compressed storage */ > -static u64 zswap_pool_total_size; > +u64 zswap_pool_total_size; > /* The number of compressed pages currently stored in zswap */ > static atomic_t zswap_stored_pages = ATOMIC_INIT(0); > /* The number of same-value filled pages currently stored in zswap */ > @@ -1231,6 +1231,7 @@ static int zswap_frontswap_store(unsigned type, pgoff_t offset, > /* update stats */ > atomic_inc(&zswap_stored_pages); > zswap_update_total_size(); > + count_vm_event(ZSWAPOUT); > > return 0; > > @@ -1273,11 +1274,10 @@ static int zswap_frontswap_load(unsigned type, pgoff_t offset, > zswap_fill_page(dst, entry->value); > kunmap_atomic(dst); > ret = 0; > - goto freeentry; > + goto stats; > } > > if (!zpool_can_sleep_mapped(entry->pool->zpool)) { > - > tmp = kmalloc(entry->length, GFP_ATOMIC); > if (!tmp) { > ret = -ENOMEM; > @@ -1292,10 +1292,8 @@ static int zswap_frontswap_load(unsigned type, pgoff_t offset, > src += sizeof(struct zswap_header); > > if (!zpool_can_sleep_mapped(entry->pool->zpool)) { > - > memcpy(tmp, src, entry->length); > src = tmp; > - > zpool_unmap_handle(entry->pool->zpool, entry->handle); > } > > @@ -1314,7 +1312,8 @@ static int zswap_frontswap_load(unsigned type, pgoff_t offset, > kfree(tmp); > > BUG_ON(ret); > - > +stats: > + count_vm_event(ZSWAPIN); > freeentry: > spin_lock(&tree->lock); > zswap_entry_put(tree, entry); > -- > 2.32.0 > >