From: "Timur Safin" <tsafin@tarantool.org> To: 'Vladislav Shpilevoy' <v.shpilevoy@tarantool.org>, tarantool-patches@dev.tarantool.org, alyapunov@tarantool.org, gorcunov@gmail.com Subject: Re: [Tarantool-patches] [PATCH v2 small 1/1] lsregion: introduce aligned alloc Date: Tue, 19 May 2020 19:21:38 +0300 [thread overview] Message-ID: <36fa01d62df9$94ec0250$bec406f0$@tarantool.org> (raw) In-Reply-To: <194d73cbb844795fbe2a9a6599bb684f4e6a0cf2.1589584903.git.v.shpilevoy@tarantool.org> Other than small note below it's looking great, but please keep in mind... : From: Vladislav Shpilevoy <v.shpilevoy@tarantool.org> : Subject: [PATCH v2 small 1/1] lsregion: introduce aligned alloc : : @@ -32,59 +32,62 @@ : #include "lsregion.h" : : void * : -lsregion_alloc_slow(struct lsregion *lsregion, size_t size, int64_t id) : +lsregion_aligned_reserve_slow(struct lsregion *lsregion, size_t size, : + size_t alignment, void **unaligned) : { : - struct lslab *slab = NULL; : - size_t slab_size = lsregion->arena->slab_size; : + void *pos; : + struct lslab *slab; : + struct slab_arena *arena = lsregion->arena; : + size_t slab_size = arena->slab_size; : : /* If there is an existing slab then try to use it. */ : if (! rlist_empty(&lsregion->slabs.slabs)) { : slab = rlist_last_entry(&lsregion->slabs.slabs, struct lslab, : next_in_list); : assert(slab != NULL); : + *unaligned = lslab_pos(slab); : + pos = (void *)small_align((size_t)*unaligned, alignment); : + if (pos + size <= lslab_end(slab)) : + return pos; Void* pointer arithmetic is non-standard, gcc extension, and I'd avoid to use it in a longer run. There are compilers is which still not support it. Timur
next prev parent reply other threads:[~2020-05-19 16:21 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-05-15 23:21 Vladislav Shpilevoy 2020-05-19 16:16 ` Aleksandr Lyapunov 2020-05-19 16:21 ` Timur Safin [this message] 2020-05-19 21:29 ` Vladislav Shpilevoy 2020-05-19 21:48 ` Timur Safin
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