From: Kent Overstreet <kent.overstreet@gmail.com>
To: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Michal Hocko <mhocko@suse.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-fsdevel@vger.kernel.org, hch@lst.de, hannes@cmpxchg.org,
akpm@linux-foundation.org, linux-clk@vger.kernel.org,
linux-tegra@vger.kernel.org, linux-input@vger.kernel.org,
rostedt@goodmis.org
Subject: Re: [PATCH v2 8/8] mm: Centralize & improve oom reporting in show_mem.c
Date: Fri, 22 Apr 2022 20:46:07 -0400 [thread overview]
Message-ID: <20220423004607.q4lbz2mplkhlbyhm@moria.home.lan> (raw)
In-Reply-To: <YmNH/fh8OwTJ6ASC@carbon>
On Fri, Apr 22, 2022 at 05:27:41PM -0700, Roman Gushchin wrote:
> You're scanning over a small portion of all shrinker lists (on a machine with
> cgroups), so the top-10 list has little value.
> Global ->count_objects() return the number of objects on the system/root_mem_cgroup
> level, not the shrinker's total.
Not quite following what you're saying here...?
If you're complaining that my current top-10-shrinker report isn't memcg aware,
that's valid - I can fix that.
> > In my experience, it's rare to be _so_ out of memory that small kmalloc
> > allocations are failing - we'll be triggering the show_mem() report before that
> > happens.
>
> I agree. However the OOM killer _has_ to make the progress even in such rare
> circumstances.
Oh, and the concern is allocator recursion? Yeah, that's a good point.
Do you know if using memalloc_noreclaim_(save|restore) is sufficient for that,
or do we want GFP_ATOMIC? I'm already using GFP_ATOMIC for allocations when we
generate the report on slabs, since we're taking the slab mutex there.
next prev parent reply other threads:[~2022-04-23 0:46 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-21 23:48 [PATCH 0/4] Printbufs & shrinker OOM reporting Kent Overstreet
2022-04-21 23:48 ` [PATCH 1/4] lib/printbuf: New data structure for heap-allocated strings Kent Overstreet
2022-04-21 23:48 ` [PATCH 2/4] mm: Add a .to_text() method for shrinkers Kent Overstreet
2022-04-22 12:21 ` Michal Hocko
2022-04-21 23:48 ` [PATCH 3/4] mm: Centralize & improve oom reporting in show_mem.c Kent Overstreet
2022-04-21 23:48 ` [PATCH 4/4] bcachefs: shrinker.to_text() methods Kent Overstreet
2022-04-21 23:48 ` [PATCH v2 0/8] Printbufs & improved shrinker debugging Kent Overstreet
2022-04-21 23:48 ` [PATCH v2 1/8] lib/printbuf: New data structure for heap-allocated strings Kent Overstreet
2022-04-22 4:20 ` Christoph Hellwig
2022-04-22 5:14 ` Kent Overstreet
2022-04-22 5:22 ` Christoph Hellwig
2022-04-22 5:40 ` Kent Overstreet
2022-04-22 5:52 ` Christoph Hellwig
2022-04-22 6:06 ` Kent Overstreet
2022-04-22 6:11 ` Christoph Hellwig
2022-04-22 6:18 ` Kent Overstreet
2022-04-22 15:37 ` Steven Rostedt
2022-04-22 19:30 ` Kent Overstreet
2022-04-22 19:39 ` Steven Rostedt
2022-04-22 20:30 ` Kent Overstreet
2022-04-22 20:47 ` Steven Rostedt
2022-04-22 21:51 ` Kent Overstreet
2022-04-22 22:20 ` Steven Rostedt
2022-04-22 20:03 ` James Bottomley
2022-04-22 21:13 ` Kent Overstreet
2022-04-23 14:16 ` Rust and Kernel Vendoring [Was Re: [PATCH v2 1/8] lib/printbuf: New data structure for heap-allocated strings] James Bottomley
2022-04-24 20:36 ` Kent Overstreet
2022-04-26 2:22 ` James Bottomley
2022-04-24 23:46 ` [PATCH v2 1/8] lib/printbuf: New data structure for heap-allocated strings Joe Perches
2022-04-25 0:45 ` Kent Overstreet
2022-04-25 2:44 ` Matthew Wilcox
2022-04-25 4:19 ` Kent Overstreet
2022-04-25 4:48 ` Joe Perches
2022-04-25 4:59 ` Kent Overstreet
2022-04-25 5:00 ` Joe Perches
2022-04-25 5:56 ` Kent Overstreet
2022-04-21 23:48 ` [PATCH v2 2/8] Input/joystick/analog: Convert from seq_buf -> printbuf Kent Overstreet
2022-04-21 23:48 ` [PATCH v2 3/8] mm/memcontrol.c: Convert to printbuf Kent Overstreet
2022-04-22 12:28 ` Michal Hocko
2022-04-21 23:48 ` [PATCH v2 4/8] clk: tegra: bpmp: " Kent Overstreet
2022-04-21 23:48 ` [PATCH v2 5/8] mm: Add a .to_text() method for shrinkers Kent Overstreet
2022-04-21 23:48 ` [PATCH v2 6/8] mm: Count requests to free & nr freed per shrinker Kent Overstreet
2022-04-21 23:48 ` [PATCH v2 7/8] mm: Move lib/show_mem.c to mm/ Kent Overstreet
2022-04-22 12:32 ` Michal Hocko
2022-04-21 23:48 ` [PATCH v2 8/8] mm: Centralize & improve oom reporting in show_mem.c Kent Overstreet
2022-04-22 12:58 ` Michal Hocko
2022-04-22 15:09 ` Roman Gushchin
2022-04-22 23:48 ` Kent Overstreet
2022-04-23 0:27 ` Roman Gushchin
2022-04-23 0:46 ` Kent Overstreet [this message]
2022-04-23 1:25 ` Roman Gushchin
2022-04-23 11:48 ` Tetsuo Handa
2022-04-25 9:28 ` Michal Hocko
2022-04-25 15:28 ` Kent Overstreet
2022-04-26 7:17 ` Michal Hocko
2022-04-26 7:26 ` Kent Overstreet
2022-04-26 7:40 ` Michal Hocko
2022-04-30 4:00 ` [PATCH 0/4] Printbufs & shrinker OOM reporting Dave Young
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