Re: [PATCH v1] mem_pool: add GIT_TRACE_MEMPOOL support

[Johannes Schindelin <Johannes.Schindelin@gmx.de>]

Hi Ben,

On Tue, 27 Nov 2018, Ben Peart wrote:

> From: Ben Peart <benpeart@microsoft.com>
> 
> Add tracing around initializing and discarding mempools. In discard report
> on the amount of memory unused in the current block to help tune setting
> the initial_size.
> 
> Signed-off-by: Ben Peart <benpeart@microsoft.com>
> ---

Looks good.

My only question: should we also trace calls to _alloc(), _calloc() and
_combine()?

Ciao,
Johannes

> 
> Notes:
>     Base Ref: * git-trace-mempool
>     Web-Diff: https://github.com/benpeart/git/commit/9ac84bbca2
>     Checkout: git fetch https://github.com/benpeart/git git-trace-mempool-v1 && git checkout 9ac84bbca2
> 
>  mem-pool.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/mem-pool.c b/mem-pool.c
> index a2841a4a9a..065389aaec 100644
> --- a/mem-pool.c
> +++ b/mem-pool.c
> @@ -5,6 +5,7 @@
>  #include "cache.h"
>  #include "mem-pool.h"
>  
> +static struct trace_key trace_mem_pool = TRACE_KEY_INIT(MEMPOOL);
>  #define BLOCK_GROWTH_SIZE 1024*1024 - sizeof(struct mp_block);
>  
>  /*
> @@ -48,12 +49,16 @@ void mem_pool_init(struct mem_pool **mem_pool, size_t initial_size)
>  		mem_pool_alloc_block(pool, initial_size, NULL);
>  
>  	*mem_pool = pool;
> +	trace_printf_key(&trace_mem_pool, "mem_pool (%p): init (%"PRIuMAX") initial size\n",
> +		pool, (uintmax_t)initial_size);
>  }
>  
>  void mem_pool_discard(struct mem_pool *mem_pool, int invalidate_memory)
>  {
>  	struct mp_block *block, *block_to_free;
>  
> +	trace_printf_key(&trace_mem_pool, "mem_pool (%p): discard (%"PRIuMAX") unused\n",
> +		mem_pool, (uintmax_t)(mem_pool->mp_block->end - mem_pool->mp_block->next_free));
>  	block = mem_pool->mp_block;
>  	while (block)
>  	{
> 
> base-commit: bb75be6cb916297f271c846f2f9caa3daaaec718
> -- 
> 2.18.0.windows.1
> 
>