linux-kernel - Re: [PATCH v6 6/9] mm: multigenerational lru: aging

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Date:   Fri, 7 Jan 2022 16:36:11 -0700
From:   Yu Zhao <yuzhao@...gle.com>
To:     Michal Hocko <mhocko@...e.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Hillf Danton <hdanton@...a.com>, Jens Axboe <axboe@...nel.dk>,
        Jesse Barnes <jsbarnes@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Jonathan Corbet <corbet@....net>,
        Matthew Wilcox <willy@...radead.org>,
        Mel Gorman <mgorman@...e.de>,
        Michael Larabel <Michael@...haellarabel.com>,
        Rik van Riel <riel@...riel.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Will Deacon <will@...nel.org>,
        Ying Huang <ying.huang@...el.com>,
        linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        page-reclaim@...gle.com, x86@...nel.org,
        Konstantin Kharlamov <Hi-Angel@...dex.ru>
Subject: Re: [PATCH v6 6/9] mm: multigenerational lru: aging

On Fri, Jan 07, 2022 at 02:11:29PM +0100, Michal Hocko wrote:
> On Tue 04-01-22 13:22:25, Yu Zhao wrote:
> [...]
> > +static void lru_gen_age_node(struct pglist_data *pgdat, struct scan_control *sc)
> > +{
> > +	struct mem_cgroup *memcg;
> > +	bool success = false;
> > +	unsigned long min_ttl = READ_ONCE(lru_gen_min_ttl);
> > +
> > +	VM_BUG_ON(!current_is_kswapd());
> > +
> > +	current->reclaim_state->mm_walk = &pgdat->mm_walk;
> > +
> > +	memcg = mem_cgroup_iter(NULL, NULL, NULL);
> > +	do {
> > +		struct lruvec *lruvec = mem_cgroup_lruvec(memcg, pgdat);
> > +
> > +		if (age_lruvec(lruvec, sc, min_ttl))
> > +			success = true;
> > +
> > +		cond_resched();
> > +	} while ((memcg = mem_cgroup_iter(NULL, memcg, NULL)));
> > +
> > +	if (!success && mutex_trylock(&oom_lock)) {
> > +		struct oom_control oc = {
> > +			.gfp_mask = sc->gfp_mask,
> > +			.order = sc->order,
> > +		};
> > +
> > +		if (!oom_reaping_in_progress())
> > +			out_of_memory(&oc);
> > +
> > +		mutex_unlock(&oom_lock);
> > +	}
> 
> Why do you need to trigger oom killer from this path? Why cannot you
> rely on the page allocator to do that like we do now?

This is per desktop users' (repeated) requests. The can't tolerate
thrashing as servers do because of UI lags; and they usually don't
have fancy tools like oomd.

Related discussions I saw:
https://github.com/zen-kernel/zen-kernel/issues/218
https://lore.kernel.org/lkml/20101028191523.GA14972@google.com/
https://lore.kernel.org/lkml/20211213051521.21f02dd2@mail.inbox.lv/
https://lore.kernel.org/lkml/54C2C89C.8080002@gmail.com/
https://lore.kernel.org/lkml/d9802b6a-949b-b327-c4a6-3dbca485ec20@gmx.com/

>From patch 8:
  Personal computers
  ------------------
  :Thrashing prevention: Write ``N`` to
   ``/sys/kernel/mm/lru_gen/min_ttl_ms`` to prevent the working set of
   ``N`` milliseconds from getting evicted. The OOM killer is invoked if
   this working set can't be kept in memory. Based on the average human
   detectable lag (~100ms), ``N=1000`` usually eliminates intolerable
   lags due to thrashing. Larger values like ``N=3000`` make lags less
   noticeable at the cost of more OOM kills.