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Before this patch we had 3 loops walking a hash chain to delete
records:
tdb_do_delete() to find the predecessor of the record that was to be
deleted. tdb_count_dead(), the name says it all and tdb_purge_dead()
to give back all dead records from a chain to the freelist.
This patch introduces tdb_trim_dead that walks a hash chain just
once. While it does so it counts the number of dead records, and all
records beyond tdb->max_dead_records are moved to the freelist.
Normal record deletion now works by always marking a record as dead in
step 1 and then calling tdb_trim_dead. This is made safe against
circular chains by doing the slow chain walk only in the case when we
did not delete a dead record during our walk.
It changes our dynamics a bit:
When deleting a record with non-zero max_dead_records, now we always
leave that number of records around when deleting, doing a blocking
lock on the freelist when we found too many dead records.
Previously when exceeding max_dead_records we wiped all dead records
to start accumulating them from scratch, assuming we could lock the
freelist in a nonblocking fashion.
The net effect for an uncontended freelist is the same: In
tdb_allocate() we still completely hand over all dead records to the
freelist when we could lock it, it just happens later than without
this patch.
This means for a lightly loaded system we will potentially leave more
dead records around in databases like locking.tdb. However, on a
heavily loaded system we become more predictable: If the freelist is
so heavily contended that across many deletes we can't get hold of it,
previously we accumulated more dead records than max_dead_records
would allow. This is a really lowlevel tradeoff that is likely hard to
measure, but to me becoming more deterministic without sacrificing too
much parallelism (we keep more dead records around) is worth trying.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Tue Oct 30 02:48:38 CET 2018 on sn-devel-144
The next commit will change the handling of dead records, removing the
"tdb_do_delete" function. As traverses should not happen in normal
operations, dead records from them should be rare, and relying on
traverses to remove them is a very bad idea IMHO.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Prevents a segfault in load_interfaces() when total interfaces == 1.
Fixes regression caused by da68a1b2f4.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13665
Signed-off-by: David Mulder <dmulder@suse.com>
Reviewed-by: Ralph Böhme <slow@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Volker Lendecke <vl@samba.org>
Autobuild-Date(master): Sun Oct 28 00:35:35 CEST 2018 on sn-devel-144
Right now we don't do transactions with mutexed tdbs. tdbtorture -m
locks up. I haven't really investigated why that is the case. The lockup
confused me quite a bit until I figured out it works fine as long as it
does not do transactions, which is all we need right now.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
This has not been activated by default for ages and can be very
inefficient. With check_merge_with_left_record() we have an
alternative that will merge freelist records while we walk it
anyway. This has reduced fragmentation significantly
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
The memlimit functionality was never utilized by Samba. It adds unneeded
complexity, so flag it as deprecated.
Signed-off-by: David Disseldorp <ddiss@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Martin Schwenke <martin@meltin.net>
Autobuild-User(master): Martin Schwenke <martins@samba.org>
Autobuild-Date(master): Fri Oct 19 03:43:58 CEST 2018 on sn-devel-144
perf said all the time was in strlen.
Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Autobuild-User(master): Douglas Bagnall <dbagnall@samba.org>
Autobuild-Date(master): Thu Oct 18 13:17:30 CEST 2018 on sn-devel-144
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Wed Oct 10 01:41:52 CEST 2018 on sn-devel-144
Try to store a record for which the (circular) freelist does not have
any entry.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This just walks tdb_find by searching for a nonexistent record
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
We can't really do the full check while the freelist is modified on the
fly. As long as we don't merge any freelist entries, we should be good
to apply this check.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This captures the tdb_rescue protection against circular hash chains
with a slow pointer updated only on every other record traverse
If a hash chain has a loop, eventually the next_ptr
will cycle around and be identical to the 'slow' pointer.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Additionally remove the associated known fail.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13616
Signed-off-by: Noel Power <noel.power@suse.com>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
object dn format should be a utf8 encoded string
Note: Currently this fails in python2 as the c python binding for
the dn string param uses PyArg_ParseTupleAndKeywords() with 's'
format, this will accept str *or* unicode in the default encoding.
The default encoding in python2 is... ascii.
Also adding here a knownfail to squash the error produced by the test.
Signed-off-by: Noel Power <noel.power@suse.com>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Fold the build option --with-json-audit into the toplevel wscript
to reflect the fact that JSON support is no longer local to the
audit subsystem.
Signed-off-by: Philipp Gesang <philipp.gesang@intra2net.com>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Allow for json_is_invalid() and json_to_string() to be used on a
const pointer. Neither function requires for the json object to
be mutable so constraining them to non-const* is unnecessary.
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
Signed-off-by: Philipp Gesang <philipp.gesang@intra2net.com>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
It seems all combinations have potential to fail here :/ however for
the moment making the assumption
* if python2 driving the build you are building against libpython2 (with the option of having python3 as 'extra-python'
* if python3 driving the build you are building against libpython3 (with the option of having python3 as 'extra-python' NOTE: this isn't inforced it probably should be !!!! In a system with python2 and python3 installed it seems waf needs PYTHON env variable to decide which libpython to build against. It's also an option that configure should use that too (to figure out which talloc_util to use or build)
However.... right now I just want the thing to build
Signed-off-by: Noel Power <noel.power@suse.com>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
We've already retrieved "ctx" in the callers of db_tdb_fetch_locked_internal().
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
At least for me this improves readability somewhat. No change in
behaviour.
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This reverts commit 8ec7eb0c01.
There was already a better fix under discusion.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
