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roots: use RateEstimator to track transids

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Make the crawl polling interval more closely track the commit interval
on the btrfs filesystem.  In the future this will provide opportunities
to do things like clear FD caches and stop crawls on deleted subvols,
but triggered by transaction commits instead of arbitrary time intervals.

Rename the "crawl" thread so it no longer has the same name as the "crawl"
task, and repurpose it for dedicated transid polling.  Cancel the deletion
of crawl_thread and repurpose it to trigger new crawls and wake up the
main crawl Task when it runs out of data.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell
2018-01-24 02:03:42 -05:00
parent 4694c7d250
commit 0fdae37962
2 changed files with 38 additions and 21 deletions
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3
src/bees.h
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@ -520,11 +520,11 @@ class BeesRoots : public enable_shared_from_this<BeesRoots> {
BeesCrawlState m_crawl_current;
map<uint64_t, shared_ptr<BeesCrawl>> m_root_crawl_map;
mutex m_mutex;
condition_variable m_condvar;
bool m_crawl_dirty = false;
Timer m_crawl_timer;
BeesThread m_crawl_thread;
BeesThread m_writeback_thread;
RateEstimator m_transid_re;
void insert_new_crawl();
void insert_root(const BeesCrawlState &bcs);
@ -543,6 +543,7 @@ class BeesRoots : public enable_shared_from_this<BeesRoots> {
void writeback_thread();
uint64_t next_root(uint64_t root = 0);
void current_state_set(const BeesCrawlState &bcs);
RateEstimator& transid_re();
friend class BeesFdCache;
friend class BeesCrawl;