From: Muchun Song <songmuchun@bytedance.com>
To: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Alexey Dobriyan <adobriyan@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@kernel.org>,
Vladimir Davydov <vdavydov.dev@gmail.com>,
Hugh Dickins <hughd@google.com>,
Shakeel Butt <shakeelb@google.com>, Roman Gushchin <guro@fb.com>,
Sami Tolvanen <samitolvanen@google.com>,
Feng Tang <feng.tang@intel.com>, Neil Brown <neilb@suse.de>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Randy Dunlap <rdunlap@infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Linux MM <linux-mm@kvack.org>, Cgroups <cgroups@vger.kernel.org>
Subject: Re: [External] Re: [PATCH v3 7/7] mm: memcontrol: make the slab calculation consistent
Date: Tue, 8 Dec 2020 15:53:05 +0800 [thread overview]
Message-ID: <CAMZfGtV=tc3=ZbePPEWTA2ziDb1hw8KzJXc+Uiedx+xmXY--XA@mail.gmail.com> (raw)
In-Reply-To: <CAM9Jb+jg7dD3u4b8P4X_6ginSM3UwVtmbdQzjaencb0r3_bAuQ@mail.gmail.com>
On Tue, Dec 8, 2020 at 3:21 PM Pankaj Gupta
<pankaj.gupta.linux@gmail.com> wrote:
>
> > Although the ratio of the slab is one, we also should read the ratio
> > from the related memory_stats instead of hard-coding. And the local
> > variable of size is already the value of slab_unreclaimable. So we
> > do not need to read again.
> >
> > We can drop the ratio in struct memory_stat. This can make the code
> > clean and simple. And get rid of the awkward mix of static and runtime
> > initialization of the memory_stats table.
> >
> > Signed-off-by: Muchun Song <songmuchun@bytedance.com>
> > ---
> > mm/memcontrol.c | 112 ++++++++++++++++++++++++++++++++++++--------------------
> > 1 file changed, 73 insertions(+), 39 deletions(-)
> >
> > diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> > index a40797a27f87..841ea37cc123 100644
> > --- a/mm/memcontrol.c
> > +++ b/mm/memcontrol.c
> > @@ -1511,49 +1511,78 @@ static bool mem_cgroup_wait_acct_move(struct mem_cgroup *memcg)
> >
> > struct memory_stat {
> > const char *name;
> > - unsigned int ratio;
> > unsigned int idx;
> > };
> >
> > static const struct memory_stat memory_stats[] = {
> > - { "anon", PAGE_SIZE, NR_ANON_MAPPED },
> > - { "file", PAGE_SIZE, NR_FILE_PAGES },
> > - { "kernel_stack", 1024, NR_KERNEL_STACK_KB },
> > - { "pagetables", PAGE_SIZE, NR_PAGETABLE },
> > - { "percpu", 1, MEMCG_PERCPU_B },
> > - { "sock", PAGE_SIZE, MEMCG_SOCK },
> > - { "shmem", PAGE_SIZE, NR_SHMEM },
> > - { "file_mapped", PAGE_SIZE, NR_FILE_MAPPED },
> > - { "file_dirty", PAGE_SIZE, NR_FILE_DIRTY },
> > - { "file_writeback", PAGE_SIZE, NR_WRITEBACK },
> > + { "anon", NR_ANON_MAPPED },
> > + { "file", NR_FILE_PAGES },
> > + { "kernel_stack", NR_KERNEL_STACK_KB },
> > + { "pagetables", NR_PAGETABLE },
> > + { "percpu", MEMCG_PERCPU_B },
> > + { "sock", MEMCG_SOCK },
> > + { "shmem", NR_SHMEM },
> > + { "file_mapped", NR_FILE_MAPPED },
> > + { "file_dirty", NR_FILE_DIRTY },
> > + { "file_writeback", NR_WRITEBACK },
> > #ifdef CONFIG_TRANSPARENT_HUGEPAGE
> > - { "anon_thp", PAGE_SIZE, NR_ANON_THPS },
> > - { "file_thp", PAGE_SIZE, NR_FILE_THPS },
> > - { "shmem_thp", PAGE_SIZE, NR_SHMEM_THPS },
> > + { "anon_thp", NR_ANON_THPS },
> > + { "file_thp", NR_FILE_THPS },
> > + { "shmem_thp", NR_SHMEM_THPS },
> > #endif
> > - { "inactive_anon", PAGE_SIZE, NR_INACTIVE_ANON },
> > - { "active_anon", PAGE_SIZE, NR_ACTIVE_ANON },
> > - { "inactive_file", PAGE_SIZE, NR_INACTIVE_FILE },
> > - { "active_file", PAGE_SIZE, NR_ACTIVE_FILE },
> > - { "unevictable", PAGE_SIZE, NR_UNEVICTABLE },
> > -
> > - /*
> > - * Note: The slab_reclaimable and slab_unreclaimable must be
> > - * together and slab_reclaimable must be in front.
> > - */
> > - { "slab_reclaimable", 1, NR_SLAB_RECLAIMABLE_B },
> > - { "slab_unreclaimable", 1, NR_SLAB_UNRECLAIMABLE_B },
> > + { "inactive_anon", NR_INACTIVE_ANON },
> > + { "active_anon", NR_ACTIVE_ANON },
> > + { "inactive_file", NR_INACTIVE_FILE },
> > + { "active_file", NR_ACTIVE_FILE },
> > + { "unevictable", NR_UNEVICTABLE },
> > + { "slab_reclaimable", NR_SLAB_RECLAIMABLE_B },
> > + { "slab_unreclaimable", NR_SLAB_UNRECLAIMABLE_B },
> >
> > /* The memory events */
> > - { "workingset_refault_anon", 1, WORKINGSET_REFAULT_ANON },
> > - { "workingset_refault_file", 1, WORKINGSET_REFAULT_FILE },
> > - { "workingset_activate_anon", 1, WORKINGSET_ACTIVATE_ANON },
> > - { "workingset_activate_file", 1, WORKINGSET_ACTIVATE_FILE },
> > - { "workingset_restore_anon", 1, WORKINGSET_RESTORE_ANON },
> > - { "workingset_restore_file", 1, WORKINGSET_RESTORE_FILE },
> > - { "workingset_nodereclaim", 1, WORKINGSET_NODERECLAIM },
> > + { "workingset_refault_anon", WORKINGSET_REFAULT_ANON },
> > + { "workingset_refault_file", WORKINGSET_REFAULT_FILE },
> > + { "workingset_activate_anon", WORKINGSET_ACTIVATE_ANON },
> > + { "workingset_activate_file", WORKINGSET_ACTIVATE_FILE },
> > + { "workingset_restore_anon", WORKINGSET_RESTORE_ANON },
> > + { "workingset_restore_file", WORKINGSET_RESTORE_FILE },
> > + { "workingset_nodereclaim", WORKINGSET_NODERECLAIM },
> > };
> >
> > +/* Translate stat items to the correct unit for memory.stat output */
> > +static int memcg_page_state_unit(int item)
> > +{
> > + int unit;
> > +
> > + switch (item) {
> > + case MEMCG_PERCPU_B:
> > + case NR_SLAB_RECLAIMABLE_B:
> > + case NR_SLAB_UNRECLAIMABLE_B:
> > + case WORKINGSET_REFAULT_ANON:
> > + case WORKINGSET_REFAULT_FILE:
> > + case WORKINGSET_ACTIVATE_ANON:
> > + case WORKINGSET_ACTIVATE_FILE:
> > + case WORKINGSET_RESTORE_ANON:
> > + case WORKINGSET_RESTORE_FILE:
> > + case WORKINGSET_NODERECLAIM:
> > + unit = 1;
> > + break;
> > + case NR_KERNEL_STACK_KB:
> > + unit = SZ_1K;
> > + break;
> > + default:
> > + unit = PAGE_SIZE;
> > + break;
> break not needed here, or maybe we can return for every case,
> that will avoid "unit" variable.
Yeah, thanks.
>
> > + }
> > +
> > + return unit;
> > +}
> > +
> > +static inline unsigned long memcg_page_state_output(struct mem_cgroup *memcg,
> > + int item)
> > +{
> > + return memcg_page_state(memcg, item) * memcg_page_state_unit(item);
> > +}
> > +
> > static char *memory_stat_format(struct mem_cgroup *memcg)
> > {
> > struct seq_buf s;
> > @@ -1577,13 +1606,12 @@ static char *memory_stat_format(struct mem_cgroup *memcg)
> > for (i = 0; i < ARRAY_SIZE(memory_stats); i++) {
> > u64 size;
> >
> > - size = memcg_page_state(memcg, memory_stats[i].idx);
> > - size *= memory_stats[i].ratio;
> > + size = memcg_page_state_output(memcg, memory_stats[i].idx);
> > seq_buf_printf(&s, "%s %llu\n", memory_stats[i].name, size);
> >
> > if (unlikely(memory_stats[i].idx == NR_SLAB_UNRECLAIMABLE_B)) {
> > - size = memcg_page_state(memcg, NR_SLAB_RECLAIMABLE_B) +
> > - memcg_page_state(memcg, NR_SLAB_UNRECLAIMABLE_B);
> > + size +=
> (memcg,
> > + NR_SLAB_RECLAIMABLE_B);
> > seq_buf_printf(&s, "slab %llu\n", size);
> > }
> > }
> > @@ -6377,6 +6405,12 @@ static int memory_stat_show(struct seq_file *m, void *v)
> > }
> >
> > #ifdef CONFIG_NUMA
> > +static inline unsigned long lruvec_page_state_output(struct lruvec *lruvec,
> > + int item)
> > +{
> > + return lruvec_page_state(lruvec, item) * memcg_page_state_unit(item);
> > +}
> > +
> > static int memory_numa_stat_show(struct seq_file *m, void *v)
> > {
> > int i;
> > @@ -6394,8 +6428,8 @@ static int memory_numa_stat_show(struct seq_file *m, void *v)
> > struct lruvec *lruvec;
> >
> > lruvec = mem_cgroup_lruvec(memcg, NODE_DATA(nid));
> > - size = lruvec_page_state(lruvec, memory_stats[i].idx);
> > - size *= memory_stats[i].ratio;
> > + size = lruvec_page_state_output(lruvec,
> > + memory_stats[i].idx);
> > seq_printf(m, " N%d=%llu", nid, size);
> > }
> > seq_putc(m, '\n');
> > --
> > 2.11.0
> >
> >
--
Yours,
Muchun
next prev parent reply other threads:[~2020-12-08 7:53 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-08 4:18 [PATCH v3 0/7] Convert all THP vmstat counters to pages Muchun Song
2020-12-08 4:18 ` [PATCH v3 1/7] mm: memcontrol: fix NR_ANON_THPS account Muchun Song
2020-12-09 1:58 ` Roman Gushchin
2020-12-08 4:18 ` [PATCH v3 2/7] mm: memcontrol: convert NR_ANON_THPS account to pages Muchun Song
2020-12-15 13:30 ` Michal Hocko
2020-12-15 13:37 ` [External] " Muchun Song
2020-12-08 4:18 ` [PATCH v3 3/7] mm: memcontrol: convert NR_FILE_THPS " Muchun Song
2020-12-08 4:18 ` [PATCH v3 4/7] mm: memcontrol: convert NR_SHMEM_THPS " Muchun Song
2020-12-08 4:18 ` [PATCH v3 5/7] mm: memcontrol: convert NR_SHMEM_PMDMAPPED " Muchun Song
2020-12-08 4:18 ` [PATCH v3 6/7] mm: memcontrol: convert NR_FILE_PMDMAPPED " Muchun Song
2020-12-08 4:18 ` [PATCH v3 7/7] mm: memcontrol: make the slab calculation consistent Muchun Song
2020-12-08 7:20 ` Pankaj Gupta
2020-12-08 7:53 ` Muchun Song [this message]
2020-12-15 13:35 ` Michal Hocko
2020-12-15 16:21 ` [External] " Muchun Song
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