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roots: reduce number of objects per TREE_SEARCH_V2, drop BEES_MAX_CRAWL_ITEMS and BEES_MAX_CRAWL_BYTES

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This makes better use of dynamic buffer sizing, and reduces the amount
of stale date lying around.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell 2021-10-12 15:32:52 -04:00
parent cf4091b352
commit 2f14a5a9c7
2 changed files with 5 additions and 11 deletions
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10
src/bees-roots.cc
View File

@ -209,7 +209,7 @@ BeesRoots::transid_max_nocache()
sk.min_objectid = sk.max_objectid = BTRFS_EXTENT_TREE_OBJECTID;
while (true) {
sk.nr_items = 1024;
sk.nr_items = 4;
BEESTRACE("transid_max search sk " << sk);
sk.do_ioctl(m_ctx->root_fd());
@ -632,7 +632,7 @@ BeesRoots::open_root_nocache(uint64_t rootid)
BEESTRACE("sk " << sk);
while (sk.min_objectid <= rootid) {
sk.nr_items = 1024;
sk.nr_items = 1;
sk.do_ioctl(m_ctx->root_fd());
if (sk.m_result.empty()) {
@ -769,7 +769,7 @@ BeesRoots::next_root(uint64_t root)
sk.min_objectid = root + 1;
while (true) {
sk.nr_items = 1024;
sk.nr_items = 1;
sk.do_ioctl(m_ctx->root_fd());
if (sk.m_result.empty()) {
@ -1005,7 +1005,7 @@ BeesCrawl::fetch_extents()
Timer crawl_timer;
BtrfsIoctlSearchKey sk(BEES_MAX_CRAWL_BYTES);
BtrfsIoctlSearchKey sk;
sk.tree_id = old_state.m_root;
sk.min_objectid = old_state.m_objectid;
sk.min_type = sk.max_type = BTRFS_EXTENT_DATA_KEY;
@ -1013,7 +1013,7 @@ BeesCrawl::fetch_extents()
sk.min_transid = old_state.m_min_transid;
// Don't set max_transid to m_max_transid here. See below.
sk.max_transid = numeric_limits<uint64_t>::max();
sk.nr_items = BEES_MAX_CRAWL_ITEMS;
sk.nr_items = 4;
// Lock in the old state
set_state(old_state);

6
src/bees.h
View File

@ -101,12 +101,6 @@ const double BEES_HASH_TABLE_ANALYZE_INTERVAL = BEES_STATS_INTERVAL;
// Stop growing the work queue after we have this many tasks queued
const size_t BEES_MAX_QUEUE_SIZE = 128;
// Read this many items at a time in SEARCHv2
const size_t BEES_MAX_CRAWL_ITEMS = 8;
// Read this many bytes at a time in SEARCHv2 (one maximum-sized metadata page)
const size_t BEES_MAX_CRAWL_BYTES = 64 * 1024;
// Insert this many items before switching to a new subvol
const size_t BEES_MAX_CRAWL_BATCH = 128;