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From: Vladimir Davydov <vdavydov.dev@gmail.com>
To: Konstantin Osipov <kostja@tarantool.org>
Cc: tarantool-patches@freelists.org
Subject: Re: [PATCH 3/8] memtx: pass engine to memory allocation functions
Date: Tue, 22 May 2018 17:39:29 +0300	[thread overview]
Message-ID: <20180522143929.jhu77fa6n57gltoo@esperanza> (raw)
In-Reply-To: <20180522134728.GC11201@atlas>

On Tue, May 22, 2018 at 04:47:28PM +0300, Konstantin Osipov wrote:
> * Vladimir Davydov <vdavydov.dev@gmail.com> [18/05/22 15:10]:
> > We need this so that we can force garbage collection when we are short
> > on memory. There are two such functions: one is used for allocating
> > index extents, another for allocating tuples. Index allocating function
> > has an opaque context so we simply reuse it for passing memtx engine to
> > it. To pass memtx engine to tuple allocating function, we add an opaque
> > engine specific pointer to tuple_format (engine_data) and set it to
> > memtx_engine for memtx spaces.
> 
> Please rename engine_data to engine.

OK.

> I would not use an opaque pointer either, reference the engine
> explicitly.

The reason I decided to make it an opaque pointer is that we might want
to reuse it in vinyl to make vy_max_tuple_size, which is currently a
global variable, a part of vy_env. The problem is vy_max_tuple_size is
used in vy_stmt.c, which knows nothing about vy_env, so to avoid cross
dependencies we will probably have to introduce vy_stmt_env to store
this variable and make tuple_format reference not the whole vy_env, but
only vy_stmt_env hence the opaque pointer.

  reply	other threads:[~2018-05-22 14:39 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-22 11:46 [PATCH 0/8] Follow-up on async memtx index cleanup Vladimir Davydov
2018-05-22 11:46 ` [PATCH 1/8] memtx: init index extent allocator in engine constructor Vladimir Davydov
2018-05-22 13:43   ` Konstantin Osipov
2018-05-22 11:46 ` [PATCH 2/8] memtx: fold memtx_tuple.cc into memtx_engine.c Vladimir Davydov
2018-05-22 13:45   ` Konstantin Osipov
2018-05-22 11:46 ` [PATCH 3/8] memtx: pass engine to memory allocation functions Vladimir Davydov
2018-05-22 13:47   ` Konstantin Osipov
2018-05-22 14:39     ` Vladimir Davydov [this message]
2018-05-22 11:46 ` [PATCH 4/8] memtx: move all global variables to engine Vladimir Davydov
2018-05-22 13:48   ` Konstantin Osipov
2018-05-22 11:46 ` [PATCH 5/8] memtx: destroy slab arena on engine shutdown Vladimir Davydov
2018-05-22 13:50   ` Konstantin Osipov
2018-05-22 16:26     ` Vladimir Davydov
2018-05-22 11:46 ` [PATCH 6/8] memtx: embed light hash into memtx_hash_index Vladimir Davydov
2018-05-22 13:51   ` Konstantin Osipov
2018-05-22 11:46 ` [PATCH 7/8] memtx: rework background garbage collection procedure Vladimir Davydov
2018-05-22 13:56   ` Konstantin Osipov
2018-05-22 14:49     ` Vladimir Davydov
2018-05-22 16:42       ` Konstantin Osipov
2018-05-22 11:46 ` [PATCH 8/8] memtx: run garbage collection on demand Vladimir Davydov
2018-05-22 14:00   ` Konstantin Osipov

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