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From: Sasha Levin <levinsasha928@gmail.com>
To: Tejun Heo <tj@kernel.org>
Cc: torvalds@linux-foundation.org, akpm@linux-foundation.org,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	paul.gortmaker@windriver.com
Subject: Re: [RFC 1/4] hashtable: introduce a small and naive hashtable
Date: Thu, 02 Aug 2012 00:41:56 +0200	[thread overview]
Message-ID: <5019B0B4.1090102@gmail.com> (raw)
In-Reply-To: <20120801202432.GE15477@google.com>

On 08/01/2012 10:24 PM, Tejun Heo wrote:
> On Wed, Aug 01, 2012 at 09:06:50PM +0200, Sasha Levin wrote:
>> Using a struct makes the dynamic case much easier, but it complicates the static case.
>>
>> Previously we could create the buckets statically.
>>
>> Consider this struct:
>>
>> struct hash_table {
>> 	u32 bits;
>> 	struct hlist_head buckets[];
>> };
>>
>> We can't make any code that wraps this to make it work properly
>> statically allocated nice enough to be acceptable.
> 
> I don't know.  Maybe you can create an anonymous outer struct / union
> and play symbol trick to alias hash_table to its member.  If it is
> gimped either way, I'm not sure whether it's really worthwhile to
> create the abstraction.  It's not like we're saving a lot of
> complexity.

I must be missing something here, but how would you avoid it?

How would your DEFINE_HASHTABLE look like if we got for the simple 'struct hash_table' approach?

> Thanks.
> 

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WARNING: multiple messages have this Message-ID (diff)
From: Sasha Levin <levinsasha928@gmail.com>
To: Tejun Heo <tj@kernel.org>
Cc: torvalds@linux-foundation.org, akpm@linux-foundation.org,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	paul.gortmaker@windriver.com
Subject: Re: [RFC 1/4] hashtable: introduce a small and naive hashtable
Date: Thu, 02 Aug 2012 00:41:56 +0200	[thread overview]
Message-ID: <5019B0B4.1090102@gmail.com> (raw)
In-Reply-To: <20120801202432.GE15477@google.com>

On 08/01/2012 10:24 PM, Tejun Heo wrote:
> On Wed, Aug 01, 2012 at 09:06:50PM +0200, Sasha Levin wrote:
>> Using a struct makes the dynamic case much easier, but it complicates the static case.
>>
>> Previously we could create the buckets statically.
>>
>> Consider this struct:
>>
>> struct hash_table {
>> 	u32 bits;
>> 	struct hlist_head buckets[];
>> };
>>
>> We can't make any code that wraps this to make it work properly
>> statically allocated nice enough to be acceptable.
> 
> I don't know.  Maybe you can create an anonymous outer struct / union
> and play symbol trick to alias hash_table to its member.  If it is
> gimped either way, I'm not sure whether it's really worthwhile to
> create the abstraction.  It's not like we're saving a lot of
> complexity.

I must be missing something here, but how would you avoid it?

How would your DEFINE_HASHTABLE look like if we got for the simple 'struct hash_table' approach?

> Thanks.
> 


  reply	other threads:[~2012-08-01 22:41 UTC|newest]

Thread overview: 75+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-07-31 18:05 [RFC 0/4] generic hashtable implementation Sasha Levin
2012-07-31 18:05 ` Sasha Levin
2012-07-31 18:05 ` [RFC 1/4] hashtable: introduce a small and naive hashtable Sasha Levin
2012-07-31 18:05   ` Sasha Levin
2012-07-31 18:23   ` Tejun Heo
2012-07-31 18:23     ` Tejun Heo
2012-07-31 20:31     ` Sasha Levin
2012-07-31 20:31       ` Sasha Levin
2012-08-01 18:19     ` Sasha Levin
2012-08-01 18:19       ` Sasha Levin
2012-08-01 18:21       ` Tejun Heo
2012-08-01 18:21         ` Tejun Heo
2012-08-01 18:24         ` Sasha Levin
2012-08-01 18:24           ` Sasha Levin
2012-08-01 18:27           ` Tejun Heo
2012-08-01 18:27             ` Tejun Heo
2012-08-01 19:06             ` Sasha Levin
2012-08-01 19:06               ` Sasha Levin
2012-08-01 20:24               ` Tejun Heo
2012-08-01 20:24                 ` Tejun Heo
2012-08-01 22:41                 ` Sasha Levin [this message]
2012-08-01 22:41                   ` Sasha Levin
2012-08-01 22:45                   ` Tejun Heo
2012-08-01 22:45                     ` Tejun Heo
2012-08-02 10:00                     ` Sasha Levin
2012-08-02 10:00                       ` Sasha Levin
2012-08-02 10:32                       ` Josh Triplett
2012-08-02 10:32                         ` Josh Triplett
2012-08-02 11:23                         ` Sasha Levin
2012-08-02 11:23                           ` Sasha Levin
2012-08-02 13:04                           ` Sasha Levin
2012-08-02 13:04                             ` Sasha Levin
2012-08-02 16:15                             ` Josh Triplett
2012-08-02 16:15                               ` Josh Triplett
2012-08-02 16:48                               ` Sasha Levin
2012-08-02 16:48                                 ` Sasha Levin
2012-08-02 17:44                                 ` Josh Triplett
2012-08-02 17:44                                   ` Josh Triplett
2012-08-02 17:54                                   ` Sasha Levin
2012-08-02 17:54                                     ` Sasha Levin
2012-08-02 20:41                                     ` Josh Triplett
2012-08-02 20:41                                       ` Josh Triplett
2012-08-02 21:47                                       ` Sasha Levin
2012-08-02 21:47                                         ` Sasha Levin
2012-08-03 17:59                                         ` Josh Triplett
2012-08-03 17:59                                           ` Josh Triplett
2012-08-02 16:03                           ` Eric W. Biederman
2012-08-02 16:03                             ` Eric W. Biederman
2012-08-02 16:34                             ` Sasha Levin
2012-08-02 16:34                               ` Sasha Levin
2012-08-02 16:40                               ` Eric W. Biederman
2012-08-02 16:40                                 ` Eric W. Biederman
2012-08-02 17:32                                 ` Linus Torvalds
2012-08-02 17:32                                   ` Linus Torvalds
2012-08-02 17:48                                   ` Eric Dumazet
2012-08-02 17:48                                     ` Eric Dumazet
2012-08-02 17:59                                   ` Josh Triplett
2012-08-02 17:59                                     ` Josh Triplett
2012-08-02 18:08                                     ` Linus Torvalds
2012-08-02 18:08                                       ` Linus Torvalds
2012-08-02 20:25                                       ` Josh Triplett
2012-08-02 20:25                                         ` Josh Triplett
2012-08-02 20:32                                         ` Linus Torvalds
2012-08-02 21:21                                           ` Josh Triplett
2012-08-02 21:21                                             ` Josh Triplett
2012-08-02 21:50                                             ` Linus Torvalds
2012-08-02 21:50                                               ` Linus Torvalds
2012-08-02  9:35             ` Josh Triplett
2012-08-02  9:35               ` Josh Triplett
2012-07-31 18:05 ` [RFC 2/4] user_ns: use new hashtable implementation Sasha Levin
2012-07-31 18:05   ` Sasha Levin
2012-07-31 18:05 ` [RFC 3/4] mm,ksm: " Sasha Levin
2012-07-31 18:05   ` Sasha Levin
2012-07-31 18:05 ` [RFC 4/4] workqueue: " Sasha Levin
2012-07-31 18:05   ` Sasha Levin

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