From: Davidlohr Bueso <dave@stgolabs.net>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: akpm@linux-foundation.org, torvalds@linux-foundation.org,
tgraf@suug.ch, manfred@colorfullife.com, mhocko@kernel.org,
guillaume.knispel@supersonicimagine.com,
linux-api@vger.kernel.org, linux-kernel@vger.kernel.org,
Davidlohr Bueso <dbueso@suse.de>
Subject: Re: [PATCH 2/5] lib/rhashtable: guarantee initial hashtable allocation
Date: Fri, 1 Jun 2018 22:41:31 -0700 [thread overview]
Message-ID: <20180602054131.ta7ligrfwbgvemfv@linux-r8p5> (raw)
In-Reply-To: <20180602044150.xpazuhpxbwt37xmu@gondor.apana.org.au>
On Sat, 02 Jun 2018, Herbert Xu wrote:
>> tbl = bucket_table_alloc(ht, size, GFP_KERNEL);
>> - if (tbl == NULL)
>> - return -ENOMEM;
>> + if (unlikely(tbl == NULL)) {
>> + size = min_t(u16, ht->p.min_size, HASH_MIN_SIZE);
>
>You mean max_t?
Not really. I considered some of the users to set quite a large min_size
(such as 1024 buckets). The min() makes sense to me in that it's the smallest
possible value. If memory later becomes available and the hashtable is resized
to a more appropriate value, couldn't any issues regarding collisions not be dealt
with organically? And we've agreed that allocating a tiny table is the
least of our problems.
Thanks,
Davidlohr
next prev parent reply other threads:[~2018-06-02 5:41 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-01 16:01 [PATCH -next v2 0/5] rhashtable: guarantee first allocation Davidlohr Bueso
2018-06-01 16:01 ` [PATCH 1/5] lib/rhashtable: convert param sanitations to WARN_ON Davidlohr Bueso
2018-06-01 16:09 ` Herbert Xu
2018-06-01 16:53 ` Davidlohr Bueso
2018-06-01 16:59 ` Herbert Xu
2018-06-01 17:10 ` Davidlohr Bueso
2018-06-01 16:01 ` [PATCH 2/5] lib/rhashtable: guarantee initial hashtable allocation Davidlohr Bueso
2018-06-02 4:41 ` Herbert Xu
2018-06-02 5:41 ` Davidlohr Bueso [this message]
2018-06-02 15:53 ` Herbert Xu
2018-06-04 11:46 ` Michal Hocko
2018-06-01 16:01 ` [PATCH 3/5] ipc: get rid of ids->tables_initialized hack Davidlohr Bueso
2018-06-01 16:01 ` [PATCH 4/5] ipc: simplify ipc initialization Davidlohr Bueso
2018-06-01 16:01 ` [PATCH 5/5] lib/test_rhashtable: rhashtable_init() can no longer fail Davidlohr Bueso
2018-06-02 4:42 ` Herbert Xu
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