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index-pack: make get_base_data() comment clearer

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A comment mentions that we may free cached delta bases via
find_unresolved_deltas(), but that function went away in f08cbf60fe
(index-pack: make quantum of work smaller, 2020-09-08). Since we need to
rewrite that comment anyway, make the entire comment clearer.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jonathan Tan 2020-10-07 13:16:58 -07:00 committed by Junio C Hamano
parent bebe171947
commit ec6a8f9705
1 changed files with 8 additions and 11 deletions
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19
builtin/index-pack.c
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@ -888,18 +888,15 @@ static void sha1_object(const void *data, struct object_entry *obj_entry,
}
/*
* Walk from current node up
* to top parent if necessary to deflate the node. In normal
* situation, its parent node would be already deflated, so it just
* needs to apply delta.
* Ensure that this node has been reconstructed and return its contents.
*
* In the worst case scenario, parent node is no longer deflated because
* we're running out of delta_base_cache_limit; we need to re-deflate
* parents, possibly up to the top base.
*
* All deflated objects here are subject to be freed if we exceed
* delta_base_cache_limit, just like in find_unresolved_deltas(), we
* just need to make sure the last node is not freed.
* In the typical and best case, this node would already be reconstructed
* (through the invocation to resolve_delta() in threaded_second_pass()) and it
* would not be pruned. However, if pruning of this node was necessary due to
* reaching delta_base_cache_limit, this function will find the closest
* ancestor with reconstructed data that has not been pruned (or if there is
* none, the ultimate base object), and reconstruct each node in the delta
* chain in order to generate the reconstructed data for this node.
*/
static void *get_base_data(struct base_data *c)
{