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authorLibravatar Jeff King <peff@peff.net>2016-08-22 17:59:42 -0400
committerLibravatar Junio C Hamano <gitster@pobox.com>2016-08-23 14:52:00 -0700
commit12d95ef6fcc1f0b83b24e926f488c6416c08d79c (patch)
tree06bbfe3fb4dee00769d8aa9e2e0655d69ce21b32 /t/t7508-status.sh
parentrelease_delta_base_cache: reuse existing detach function (diff)
downloadtgif-12d95ef6fcc1f0b83b24e926f488c6416c08d79c.tar.xz
delta_base_cache: use list.h for LRU
We keep an LRU list of entries for when we need to drop something from an over-full cache. The list is implemented as a circular doubly-linked list, which is exactly what list.h provides. We can save a few lines by using the list.h macros and functions. More importantly, this makes the code easier to follow, as the reader sees explicit concepts like "list_add_tail()" instead of pointer manipulation. As a bonus, the list_entry() macro lets us place the lru pointers anywhere inside the delta_base_cache_entry struct (as opposed to just casting the pointer, which requires it at the front of the struct). This will be useful in later patches when we need to place other items at the front of the struct (e.g., our hashmap implementation requires this). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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