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Message-ID: <Yh6QqEFTxUuDEst2@bombadil.infradead.org> Date: Tue, 1 Mar 2022 13:31:20 -0800 From: Luis Chamberlain <mcgrof@...nel.org> To: "Eric W. Biederman" <ebiederm@...ssion.com> Cc: Shakeel Butt <shakeelb@...gle.com>, Colin Ian King <colin.king@...onical.com>, NeilBrown <neilb@...e.de>, Vasily Averin <vvs@...tuozzo.com>, Vlastimil Babka <vbabka@...e.cz>, Michal Hocko <mhocko@...e.com>, Roman Gushchin <roman.gushchin@...ux.dev>, Linux MM <linux-mm@...ck.org>, netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, Tejun Heo <tj@...nel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Eric Dumazet <edumazet@...gle.com>, Kees Cook <keescook@...omium.org>, Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>, David Ahern <dsahern@...nel.org>, linux-kernel@...r.kernel.org, kernel@...nvz.org Subject: Re: [PATCH RFC] net: memcg accounting for veth devices On Tue, Mar 01, 2022 at 01:25:16PM -0800, Luis Chamberlain wrote: > diff --git a/kernel/ucount.c b/kernel/ucount.c > index 4f5613dac227..980ffaba1ac5 100644 > --- a/kernel/ucount.c > +++ b/kernel/ucount.c > @@ -238,6 +238,8 @@ struct ucounts *inc_ucount(struct user_namespace *ns, kuid_t uid, > long max; > tns = iter->ns; > max = READ_ONCE(tns->ucount_max[type]); > + if (atomic_long_read(&iter->ucount[type]) > max/16) > + cond_resched(); > if (!atomic_long_inc_below(&iter->ucount[type], max)) > goto fail; You can of course ignore this, it was just a hack to try to avoid a soft lockup on the workqueues. Luis
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