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Re: [PATCH 1/6] object.c: parse commit in graph first




On Tue, Apr 03, 2018 at 11:21:36AM -0700, Jonathan Tan wrote:

> On Tue,  3 Apr 2018 12:51:38 -0400
> Derrick Stolee <dstolee@xxxxxxxxxxxxx> wrote:
> 
> > Most code paths load commits using lookup_commit() and then
> > parse_commit(). In some cases, including some branch lookups, the commit
> > is parsed using parse_object_buffer() which side-steps parse_commit() in
> > favor of parse_commit_buffer().
> > 
> > Before adding generation numbers to the commit-graph, we need to ensure
> > that any commit that exists in the graph is loaded from the graph, so
> > check parse_commit_in_graph() before calling parse_commit_buffer().
> > 
> > Signed-off-by: Derrick Stolee <dstolee@xxxxxxxxxxxxx>
> 
> Modifying parse_object_buffer() is the most pragmatic way to accomplish
> this, but this also means that parse_object_buffer() now potentially
> reads from the local object store (instead of only relying on what's in
> memory and what's in the provided buffer). parse_object_buffer() is
> called by several callers including in builtin/fsck.c. I would feel more
> comfortable if the relevant [1] caller to parse_object_buffer() was
> modified instead of parse_object_buffer(), but I'll let others give
> their opinions too.

It's not just you. This seems like a really odd place to put it.
Especially because if we have the buffer to pass to this function, then
we'd already have incurred the cost to inflate the object.

-Peff