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From: Jeff Hostetler <git@jeffhostetler.com>
To: Christian Couder <christian.couder@gmail.com>, git@vger.kernel.org
Cc: Junio C Hamano <gitster@pobox.com>,
	Jeff Hostetler <jeffhost@microsoft.com>,
	Jonathan Tan <jonathantanmy@google.com>,
	Derrick Stolee <stolee@gmail.com>, Kevin Daudt <me@ikke.info>,
	Christian Couder <chriscool@tuxfamily.org>
Subject: Re: [PATCH v2 2/2] sha1_file: improve sha1_file_name() perfs
Date: Wed, 17 Jan 2018 15:37:55 -0500	[thread overview]
Message-ID: <3cbace45-61df-3074-a48c-66c68c96d542@jeffhostetler.com> (raw)
In-Reply-To: <20180117175455.9316-2-chriscool@tuxfamily.org>



On 1/17/2018 12:54 PM, Christian Couder wrote:
> As sha1_file_name() could be performance sensitive, let's
> try to make it faster by seeding the initial buffer size
> to avoid any need to realloc and by using strbuf_addstr()
> and strbuf_addc() instead of strbuf_addf().
> 
> Helped-by: Derrick Stolee <stolee@gmail.com>
> Helped-by: Jeff Hostetler <git@jeffhostetler.com>
> Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
> ---
>   sha1_file.c | 8 +++++++-
>   1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/sha1_file.c b/sha1_file.c
> index f66c21b2da..1a94716962 100644
> --- a/sha1_file.c
> +++ b/sha1_file.c
> @@ -323,8 +323,14 @@ static void fill_sha1_path(struct strbuf *buf, const unsigned char *sha1)
>   
>   void sha1_file_name(struct strbuf *buf, const unsigned char *sha1)
>   {
> -	strbuf_addf(buf, "%s/", get_object_directory());
> +	const char *obj_dir = get_object_directory();
> +	size_t extra = strlen(obj_dir) + 1 + GIT_MAX_HEXSZ;

Very minor nit.  Should this be "+3" rather than "+1"?
One for the slash after obj_dir, one for the slash between
"xx/y[38]", and one for the trailing NUL.

>   
> +	if (extra > strbuf_avail(buf))
> +		strbuf_grow(buf, extra);
> +
> +	strbuf_addstr(buf, obj_dir);
> +	strbuf_addch(buf, '/');
>   	fill_sha1_path(buf, sha1);
>   }
>   
> 

  reply	other threads:[~2018-01-17 20:38 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-17 17:54 [PATCH v2 1/2] sha1_file: remove static strbuf from sha1_file_name() Christian Couder
2018-01-17 17:54 ` [PATCH v2 2/2] sha1_file: improve sha1_file_name() perfs Christian Couder
2018-01-17 20:37   ` Jeff Hostetler [this message]
2018-01-17 20:54     ` Junio C Hamano
2018-01-17 22:27       ` Jeff King
2018-01-17 21:44     ` Christian Couder

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