From: Shakeel Butt <shakeelb@google.com>
To: Roman Gushchin <guro@fb.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Christoph Lameter <cl@linux.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@kernel.org>, Linux MM <linux-mm@kvack.org>,
Vlastimil Babka <vbabka@suse.cz>,
Kernel Team <kernel-team@fb.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v6 02/19] mm: memcg: prepare for byte-sized vmstat items
Date: Wed, 17 Jun 2020 08:55:22 -0700 [thread overview]
Message-ID: <CALvZod61ejfKiHRGNBQHKCyWbLr_DrRRzUQh7WVXJYSUu-098w@mail.gmail.com> (raw)
In-Reply-To: <20200608230654.828134-3-guro@fb.com>
On Mon, Jun 8, 2020 at 4:07 PM Roman Gushchin <guro@fb.com> wrote:
>
> To implement per-object slab memory accounting, we need to
> convert slab vmstat counters to bytes. Actually, out of
> 4 levels of counters: global, per-node, per-memcg and per-lruvec
> only two last levels will require byte-sized counters.
> It's because global and per-node counters will be counting the
> number of slab pages, and per-memcg and per-lruvec will be
> counting the amount of memory taken by charged slab objects.
>
> Converting all vmstat counters to bytes or even all slab
> counters to bytes would introduce an additional overhead.
> So instead let's store global and per-node counters
> in pages, and memcg and lruvec counters in bytes.
>
> To make the API clean all access helpers (both on the read
> and write sides) are dealing with bytes.
>
> To avoid back-and-forth conversions a new flavor of read-side
> helpers is introduced, which always returns values in pages:
> node_page_state_pages() and global_node_page_state_pages().
>
> Actually new helpers are just reading raw values. Old helpers are
> simple wrappers, which will complain on an attempt to read
> byte value, because at the moment no one actually needs bytes.
>
> Thanks to Johannes Weiner for the idea of having the byte-sized API
> on top of the page-sized internal storage.
>
> Signed-off-by: Roman Gushchin <guro@fb.com>
> Acked-by: Johannes Weiner <hannes@cmpxchg.org>
> Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
next prev parent reply other threads:[~2020-06-17 15:55 UTC|newest]
Thread overview: 92+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-08 23:06 [PATCH v6 00/19] The new cgroup slab memory controller Roman Gushchin
2020-06-08 23:06 ` [PATCH v6 01/19] mm: memcg: factor out memcg- and lruvec-level changes out of __mod_lruvec_state() Roman Gushchin
2020-06-17 1:52 ` Shakeel Butt
2020-06-17 2:50 ` Roman Gushchin
2020-06-17 2:59 ` Shakeel Butt
2020-06-17 3:19 ` Roman Gushchin
2020-06-08 23:06 ` [PATCH v6 02/19] mm: memcg: prepare for byte-sized vmstat items Roman Gushchin
2020-06-17 2:57 ` Shakeel Butt
2020-06-17 3:19 ` Roman Gushchin
2020-06-17 15:55 ` Shakeel Butt [this message]
2020-06-08 23:06 ` [PATCH v6 03/19] mm: memcg: convert vmstat slab counters to bytes Roman Gushchin
2020-06-17 3:03 ` Shakeel Butt
2020-06-08 23:06 ` [PATCH v6 04/19] mm: slub: implement SLUB version of obj_to_index() Roman Gushchin
2020-06-17 3:08 ` Shakeel Butt
2020-06-08 23:06 ` [PATCH v6 05/19] mm: memcontrol: decouple reference counting from page accounting Roman Gushchin
2020-06-18 0:47 ` Shakeel Butt
2020-06-18 14:55 ` Shakeel Butt
2020-06-18 19:51 ` Roman Gushchin
2020-06-19 1:08 ` Roman Gushchin
2020-06-19 1:18 ` Shakeel Butt
2020-06-19 1:31 ` Shakeel Butt
2020-06-08 23:06 ` [PATCH v6 06/19] mm: memcg/slab: obj_cgroup API Roman Gushchin
2020-06-19 15:42 ` Shakeel Butt
2020-06-19 21:38 ` Roman Gushchin
2020-06-19 22:16 ` Shakeel Butt
2020-06-19 22:52 ` Roman Gushchin
2020-06-20 22:50 ` Andrew Morton
2020-06-08 23:06 ` [PATCH v6 07/19] mm: memcg/slab: allocate obj_cgroups for non-root slab pages Roman Gushchin
2020-06-19 16:36 ` Shakeel Butt
2020-06-20 0:25 ` Roman Gushchin
2020-06-20 0:31 ` Shakeel Butt
2020-06-08 23:06 ` [PATCH v6 08/19] mm: memcg/slab: save obj_cgroup for non-root slab objects Roman Gushchin
2020-06-20 0:16 ` Shakeel Butt
2020-06-20 1:19 ` Roman Gushchin
2020-06-08 23:06 ` [PATCH v6 09/19] mm: memcg/slab: charge individual slab objects instead of pages Roman Gushchin
2020-06-20 0:54 ` Shakeel Butt
2020-06-20 1:29 ` Roman Gushchin
2020-06-08 23:06 ` [PATCH v6 10/19] mm: memcg/slab: deprecate memory.kmem.slabinfo Roman Gushchin
2020-06-22 17:12 ` Shakeel Butt
2020-06-22 18:01 ` Roman Gushchin
2020-06-22 18:09 ` Shakeel Butt
2020-06-22 18:25 ` Roman Gushchin
2020-06-22 18:38 ` Shakeel Butt
2020-06-08 23:06 ` [PATCH v6 11/19] mm: memcg/slab: move memcg_kmem_bypass() to memcontrol.h Roman Gushchin
2020-06-20 1:19 ` Shakeel Butt
2020-06-08 23:06 ` [PATCH v6 12/19] mm: memcg/slab: use a single set of kmem_caches for all accounted allocations Roman Gushchin
2020-06-22 16:56 ` Shakeel Butt
2020-06-08 23:06 ` [PATCH v6 13/19] mm: memcg/slab: simplify memcg cache creation Roman Gushchin
2020-06-22 17:29 ` Shakeel Butt
2020-06-22 17:40 ` Roman Gushchin
2020-06-22 18:03 ` Shakeel Butt
2020-06-08 23:06 ` [PATCH v6 14/19] mm: memcg/slab: remove memcg_kmem_get_cache() Roman Gushchin
2020-06-22 18:42 ` Shakeel Butt
2020-06-08 23:06 ` [PATCH v6 15/19] mm: memcg/slab: deprecate slab_root_caches Roman Gushchin
2020-06-22 17:36 ` Shakeel Butt
2020-06-08 23:06 ` [PATCH v6 16/19] mm: memcg/slab: remove redundant check in memcg_accumulate_slabinfo() Roman Gushchin
2020-06-22 17:32 ` Shakeel Butt
2020-06-08 23:06 ` [PATCH v6 17/19] mm: memcg/slab: use a single set of kmem_caches for all allocations Roman Gushchin
2020-06-17 23:35 ` Andrew Morton
2020-06-18 0:35 ` Roman Gushchin
2020-06-18 7:33 ` Vlastimil Babka
2020-06-18 19:54 ` Roman Gushchin
2020-06-22 19:21 ` Shakeel Butt
2020-06-22 20:37 ` Roman Gushchin
2020-06-22 21:04 ` Shakeel Butt
2020-06-22 21:13 ` Roman Gushchin
2020-06-22 21:28 ` Shakeel Butt
2020-06-22 21:58 ` Roman Gushchin
2020-06-22 22:05 ` Shakeel Butt
2020-06-08 23:06 ` [PATCH v6 18/19] kselftests: cgroup: add kernel memory accounting tests Roman Gushchin
2020-06-17 1:46 ` [PATCH v6 00/19] The new cgroup slab memory controller Shakeel Butt
2020-06-17 2:41 ` Roman Gushchin
2020-06-17 3:05 ` Shakeel Butt
2020-06-17 3:32 ` Roman Gushchin
2020-06-17 11:24 ` Vlastimil Babka
2020-06-17 14:31 ` Mel Gorman
2020-06-20 0:57 ` Roman Gushchin
2020-06-18 1:29 ` Roman Gushchin
2020-06-18 8:43 ` Jesper Dangaard Brouer
2020-06-18 9:31 ` Jesper Dangaard Brouer
2020-06-19 1:30 ` Roman Gushchin
2020-06-19 8:32 ` Jesper Dangaard Brouer
2020-06-19 1:27 ` Roman Gushchin
2020-06-19 9:39 ` Jesper Dangaard Brouer
2020-06-19 18:47 ` Roman Gushchin
2020-06-18 1:18 ` Roman Gushchin
2020-06-18 9:27 ` Mike Rapoport
2020-06-18 20:43 ` Roman Gushchin
2020-06-21 22:57 ` Qian Cai
2020-06-21 23:34 ` Roman Gushchin
2020-06-21 23:53 ` Qian Cai
2020-06-22 3:07 ` Roman Gushchin
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