Re: [REGRESSION, BISECTED] `git checkout <branch>` started to be memory hog

> How about:
>
> -- >8 --
> Subject: [PATCH] streaming: free git_istream upon closing
>
> Kirill Smelkov noticed that post-1.7.6 "git checkout"
> started leaking tons of memory. The streaming_write_entry
> function properly calls close_istream(), but that function
> did not actually free() the allocated git_istream struct.
>
> The git_istream struct is totally opaque to calling code,
> and must be heap-allocated by open_istream. Therefore it's
> not appropriate for callers to have to free it.
>
> This patch makes close_istream() into "close and de-allocate
> all associated resources". We could add a new "free_istream"
> call, but there's not much point in letting callers inspect
> the istream after close. And this patch's semantics make us
> match fopen/fclose, which is well-known and understood.
>
> Signed-off-by: Jeff King <peff@peff.net>