[tarantool-patches] [PATCH v1 1/1] box: restore region after box.snapshot()

[Vladislav Shpilevoy]

Vova, please, review.

On 03/11/2018 17:11, imeevma at tarantool.org wrote:
> Before this patch region wasn't restored after box.snapshot() so
> some tests fail due to "memory leak". After this patch region will
> be restored using region_truncate(). It could be done by cleaning
> memory in case there wasn't active transaction but it seems like
> region_truncate() is more universal.
> 
> Closes #3732
> ---
> Issue: https://github.com/tarantool/tarantool/issues/3732
> Branch: https://github.com/tarantool/tarantool/tree/imeevma/gh-3732-restore_region_after_box_snapshot
> 
>   src/box/box.cc                |  2 ++
>   test/engine/snapshot.result   | 35 +++++++++++++++++++++++++++++++++++
>   test/engine/snapshot.test.lua | 17 +++++++++++++++++
>   3 files changed, 54 insertions(+)
> 
> diff --git a/src/box/box.cc b/src/box/box.cc
> index c4b4fb4..0d27aa2 100644
> --- a/src/box/box.cc
> +++ b/src/box/box.cc
> @@ -2157,6 +2157,7 @@ box_checkpoint()
>   	if (! is_box_configured)
>   		return 0;
>   	int rc = 0;
> +	size_t used = region_used(&fiber()->gc);
>   	if (box_checkpoint_is_in_progress) {
>   		diag_set(ClientError, ER_CHECKPOINT_IN_PROGRESS);
>   		return -1;
> @@ -2181,6 +2182,7 @@ end:
>   
>   	latch_unlock(&schema_lock);
>   	box_checkpoint_is_in_progress = false;
> +	region_truncate(&fiber()->gc, used);
>   	return rc;
>   }
>   
> diff --git a/test/engine/snapshot.result b/test/engine/snapshot.result
> index a5aa08d..42009c2 100644
> --- a/test/engine/snapshot.result
> +++ b/test/engine/snapshot.result
> @@ -238,3 +238,38 @@ box.space.test.index.secondary:select{}
>   box.space.test:drop()
>   ---
>   ...
> +--
> +-- sql: fix sql/gh-3199-no-mem-leaks.test.lua
> +-- One of the reason why this test failed - box.snapshot didn't
> +-- free region.
> +--
> +fiber = require('fiber')
> +---
> +...
> +-- Should be 0.
> +fiber.info()[fiber.self().id()].memory.used
> +---
> +- 0
> +...
> +box.snapshot()
> +---
> +- ok
> +...
> +-- Should be 0.
> +fiber.info()[fiber.self().id()].memory.used
> +---
> +- 0
> +...
> +box.snapshot()
> +---
> +- ok
> +...
> +box.snapshot()
> +---
> +- ok
> +...
> +-- Should be 0.
> +fiber.info()[fiber.self().id()].memory.used
> +---
> +- 0
> +...
> diff --git a/test/engine/snapshot.test.lua b/test/engine/snapshot.test.lua
> index 4bbbe40..2a32280 100644
> --- a/test/engine/snapshot.test.lua
> +++ b/test/engine/snapshot.test.lua
> @@ -41,3 +41,20 @@ box.space.test:select{}
>   box.space.test.index.primary:select{}
>   box.space.test.index.secondary:select{}
>   box.space.test:drop()
> +
> +--
> +-- sql: fix sql/gh-3199-no-mem-leaks.test.lua
> +-- One of the reason why this test failed - box.snapshot didn't
> +-- free region.
> +--
> +
> +fiber = require('fiber')
> +-- Should be 0.
> +fiber.info()[fiber.self().id()].memory.used
> +box.snapshot()
> +-- Should be 0.
> +fiber.info()[fiber.self().id()].memory.used
> +box.snapshot()
> +box.snapshot()
> +-- Should be 0.
> +fiber.info()[fiber.self().id()].memory.used
>