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Message-ID: <efd58582-31b6-47f0-ba14-bf369fddd1c0@kernel.org>
Date: Wed, 6 Dec 2023 10:51:49 -0700
From: David Ahern <dsahern@...nel.org>
To: Stephen Hemminger <stephen@...workplumber.org>,
Judy Hsiao <judyhsiao@...omium.org>
Cc: Eric Dumazet <edumazet@...gle.com>, Simon Horman <horms@...nel.org>,
Douglas Anderson <dianders@...omium.org>, Brian Haley
<haleyb.dev@...il.com>, "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>, Joel Granados <joel.granados@...il.com>,
Julian Anastasov <ja@....bg>, Leon Romanovsky <leon@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org
Subject: Re: [PATCH v2] neighbour: Don't let neigh_forced_gc() disable
preemption for long
On 12/6/23 10:39 AM, Stephen Hemminger wrote:
> On Wed, 6 Dec 2023 03:38:33 +0000
> Judy Hsiao <judyhsiao@...omium.org> wrote:
>
>> diff --git a/net/core/neighbour.c b/net/core/neighbour.c
>> index df81c1f0a570..552719c3bbc3 100644
>> --- a/net/core/neighbour.c
>> +++ b/net/core/neighbour.c
>> @@ -253,9 +253,11 @@ static int neigh_forced_gc(struct neigh_table *tbl)
>> {
>> int max_clean = atomic_read(&tbl->gc_entries) -
>> READ_ONCE(tbl->gc_thresh2);
>> + u64 tmax = ktime_get_ns() + NSEC_PER_MSEC;
>> unsigned long tref = jiffies - 5 * HZ;
>> struct neighbour *n, *tmp;
>> int shrunk = 0;
>> + int loop = 0;
>>
>> NEIGH_CACHE_STAT_INC(tbl, forced_gc_runs);
>>
>> @@ -278,11 +280,16 @@ static int neigh_forced_gc(struct neigh_table *tbl)
>> shrunk++;
>> if (shrunk >= max_clean)
>> break;
>> + if (++loop == 16) {
>
> Overall looks good.
> Minor comments:
> - loop count should probably be unsigned
> - the magic constant 16 should be a sysctl tuneable
A tunable is needed here; the loop counter is just to keep the overhead
of the ktime_get_ns call in check.
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