Add cds_lfht_ prefix to fls_ulong, get_count_order_ulong, get_count_order_u32

As those are not static anymore (used in plugins).

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Merge branch 'master' into urcu/ht-shrink

Version 0.6.7

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add compat file for test urcu wfs

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add missing compat file for wfq test

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

urcu-bp: no need for weak attribute

We should do this within the user (e.g. liblttng-ust), not within the
urcu-bp library.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Merge branch 'master' into urcu/ht-shrink

hlist.h: Add missing stddef.h include for NULL

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Merge branch 'master' into urcu/ht-shrink

Conflicts:
Makefile.am
urcu-bp.c

call_rcu: Add missing call_rcu_before_fork and call_rcu_after_fork_parent declarations

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: Simplify default logic

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: default mm type

In the original patch from Lai Jiangshan <laijs@cn.fujitsu.com>:

When I test backend with the following commands.
(my box is x86_64 with 4 cores/logic cpus)
**(test with Load factor = 100% only)**

./tests/test_urcu_hash 4 0 10 -B mmap -h $((1<<19)) -p $((1<<19))
./tests/test_urcu_hash 4 0 10 -B mmap -h $((1<<18)) -p $((1<<18))
./tests/test_urcu_hash 4 0 10 -B mmap -h $((1<<17)) -p $((1<<17))
./tests/test_urcu_hash 4 0 10 -B mmap -h $((1<<16)) -p $((1<<16))
                    4readers/no writer

It shows that mmap backend is about 6% better over order backend.
(It also shows that chunk backend is (worse than)/(the same as) order
backend for small/large min_nr_alloc_buckets. (use -m when test)).

Note:
"6%" and the google-perftools told us the bucket_at() is not the
critical bottleneck.

new strategy:
* infinite buckets size                  --> order mm
* otherwise if 64bits,
   with number of buckets <= (1 << 32)   --> mmap mm
* otherwise                              --> order mm

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash,test: add memory_backend argument

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash,test: add max_hash_buckets_size argument

[ Edit by Mathieu Desnoyers: clarify the test program printouts. ]

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

cleanup duplicated code

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

cleanup unneed declare

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

disable warning when -DNDEBUG(disable assert())

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Describe autotools/libtool/automake version dependency

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Remove m4_ifdef for AC_PROG_LIBTOOL (deprecated)

This trick does not seem to work anyway.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Support older autotools

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Apply autoupdate to configure.ac

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix build for amd64 environment (for FreeBSD 8.2)

Signed-off-by: David Goulet <dgoulet@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix cds_lfht field order

* Lai Jiangshan (laijs@cn.fujitsu.com) wrote:
> 3fd3f554f6eb18ae5ec526b82025a53a554f775d are wrong,
>
> 1) dynamic len tbl_chunk must at the end of cds_lfht, (so I put all the mm field at the end of cds_lfht).

My bad, will fix.

>
> 2) lists of hot access fields:
> size
> tbl_order/chunk/mmap
> bucket_at
> flags (testing for counting)
> split_count
> min_alloc_buckets_order (bucket_at() for chunk mm)
> min_nr_alloc_buckets (buket_at() for order mm and chunk mm)

Suggested-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash mm plugins: cleanup alloc

- Ensure the order of fields set match the cds_lfht field order.
- 80 cols cleanup.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: document fini_table

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: likely -> caa_likely fix

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: cleanup ht_count_add/ht_count_del

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: reorder cds_lfht for smaller cache footprint in fast-paths

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

add rculfhash-mm-mmap.c memory management

[ Edit by Mathieu Desnoyers:
  - change "buckets" for "mmap" to better show the mapping between the
    union member and the mm plugin.
  - 80 col coding style fixups. ]

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

add rculfhash-mm-chunk.c memory management

[ Edit by Mathieu Desnoyers: Update comment above
  struct cds_lfht_node *tbl_chunk. ]

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

move memory management code out as rculfhash-mm-order.c

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Merge struct rcu_table into struct cds_lfht

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

use rcu_flavor for rculfhash

Make the sizeof(struct cds_lfht) smaller

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add rcu_flavor

Not all related functions are added.
Left functions will be added when needed.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

add max_nr_buckets argument

[ Edit by Mathieu Desnoyers: clarify cds_lfht_new() description. ]

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rename min_alloc_size/min_alloc_order

[ Mathieu Desnoyers:

  This clarifies that the amount of buckets allocated can differ from
  the number of buckets chained together, especially for small hash
  tables, where we don't free under min_nr_alloc_buckets. ]

Suggested-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

remove struct rcu_level

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

it is not required that ht->t.size >= ht->min_table_size anymore

Original code always ensure ht->t.size >= ht->min_table_size.
This can be improved: ht->min_table_size should be used for allocation,
not for the bucket size in use.

Why does the original code need to always ensure this ?

  Original code don't do special alloc/free when

    ht->t.size < ht->min_table_size

  in init_table()/fini_table(), so we have to force

    ht->t.size >= ht->min_table_size.

Why does new code become flexible ?

  New code use the wrappers, they handle the special cases.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

proper wrapper for bucket table alloc and free

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

introduce bucket_at() and improve readability

Fast path is not changed.
It will slow down very little for slow path.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add missing rcu_dereference_sym_bp

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

urcu-bp: allow weak linking

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add Lai Jiangshan's copyright to rculfhash

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Update comments of cds_lfht_new()

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Install test scripts in the dist tarball

Fix for http://lttng.org/issue/250
Allows running `make check' when installing from the tarball

Signed-off-by: Alexandre Montplaisir <alexandre.montplaisir@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: constify all key arguments passed to API

The hash table never needs to modify the key, it is only ever used for
"match", so it should always be received as a const argument.

Reported-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix arguments order

use: hash, match, key

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: Add parenthesis around macro arg use in iterator macro

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add hash table iterator macros

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Remove whiteline

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: rename dummy to bucket

[ Edit by Mathieu Desnoyers: rebased. ]

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: Move key out of struct lfht_test_node, move key_len to caller

Make struct lfht_test_node only contains basic field.
Let user take the responsibility to handle the <key>(hash_set)
or <key,value>(hash_map) management and calculation.

[ Edit by Mathieu Desnoyers: rebased on top of commit
  0422d92c2d658f6093b8209f75808efd2109a110 ]

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: Remove leftover hash_seed field

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: extract compare_fct and hash_fct from the hash table

Leave the compare_fct and hash_fct to the caller, which can therefore
become the only one which needs to know the layout of struct
cds_lfht_node (except for the _cds_lfht_node part).

This will enable us to remove the cds_lfht_node structure from the hash
table (moving it entirely to the caller), replacing it by
_cds_lfht_node, which is really the only part the hash table needs to
know about.

Use-cases that can benefit from this extra flexibility:

>> Sometimes the caller don't have the key or the keys which are big
>> are saved separated. Example: file server
>> Or key comparation is too slow.
>> Or caller just need approximate lookup.
>> Or caller want to compare keys with different strategies for
>> performance.

Suggested-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Version 0.6.6

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Merge branch 'master' into urcu/ht-shrink

qsbr vs call_rcu : remove exit assertion

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: Move "struct rcu_head head" out of "struct cds_lfht_node"

It is user's responsibility to free it by call_rcu(),
synchronize_rcu() or defer_rcu().

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash, test: wrap struct cds_lfht_node

Use struct lfht_test_node for test instead of struct cds_lfht_node.
We can add test related things in struct lfht_test_node in future.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: Change lazy shrink strategy

We can aggressively grow a ht,
but we should conservatively shrink a ht.

When we try to shrink the ht after a deletion,
but if a growing is required after it, we should
stop this shrink.

But it is more complicated to implement it, so we use more
conservative strategy to shrink a ht to gain simple code:

We stop to (lazy) shrink when we found growing is
in progress.

[ Edit by Mathieu Desnoyers: Add documentation, cleanup. ]

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: merge duplicated code of cds_lfht_resize_lazy_*()

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: Fix ht lazy grow logic.

"size < target_size" in cds_lfht_resize_lazy() which is always true
confuses me.

I think we should grow the ht only when we success to increase
the resize_target.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: rename likely/unlikely (add caa_ prefix)

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Merge branch 'master' into urcu/ht-shrink

Fixed conflicts:
tests/test_urcu_qsbr.c
tests/test_urcu_qsbr_gc.c

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Rename likely/unlikely to caa_likely/caa_unlikely

This fixes namespace conflicts.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add structure descriptions, remove redundant clear_flag()

Reported-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix CAA_BITS_PER_lONG typo

Should instead be CAA_BITS_PER_LONG.

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: add min_alloc_size test parameter

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: Fix min_alloc_size bug

When I change MIN_ALLOC_ORDER macro to parameter,
I forgot set min_alloc_order before used it which causes bug.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: Fix ht allocation bug

Fix a bug introduced by Lai Jiangshan <laijs@cn.fujitsu.com>:
alloc_split_items_count() use a wrong flags.

ht->flags should be inited earlier.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: add CDS_LFHT_ACCOUNTING flag

[ Edit by Mathieu Desnoyers: fix null pointer in poison_free. ]

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: use DEFAULT_SPLIT_COUNT_MASK for !HAVE_SYSCONF

Now, item accounting is always available.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: use hash for index if !HAVE_SCHED_GETCPU

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: rename percpu_count to split_count

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: Cast to struct rcu_level * instead of void * (cleanup)

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: directly lookup bucket in the first order table

[ Edit by Mathieu Desnoyers: add a dbg_printf so the start-of-table
  lookup prints the same dbg messages as normal lookups. ]

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Avoid alloc small memory pieces

Add min_alloc_size (minimum allocation size) for allocation.

Now we can gain better cache locality by specifying larger minimum
allocation size.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: Remove unneed branches

By the effect of previous patch, some unneed branches can be removed.
One of them is in the fast path.

These branches are mostly special-cases for the node "0", which is
always populated after hash table new.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: create dummy nodes directly when create lfht

make cds_lfht_new() can be called earlier(before rcu is initialized
..etc) If caller want to *parallelly* init the dummy nodes with large
init_size, he can use cds_lfht_new()+cds_lfht_resize() combination.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: fix uniquely add vs cds_lfht_next observation semantic

Is it a bug?

It depends.

Current code(a combination of add_replace and add_unique)
does never generate duplicated keys, but it only
guarantees snapshot semantic: If we take a snapshot of the
hash table, we can observe that there are no duplicated keys
in the snapshot.

But this definition don't work in practice, we don't take snapshot
before observe, we actually observe them one by one.
Example:

cds_lfht_lookup(&iter);
while (should_end(&iter)) {
do_something_with(&iter);
cds_lfht_next(&iter);
}

In the old code, we may do_something_with/observe 2 duplicate nodes
in this practice!

Here is an identical-hash-value node chain with no duplicated keys
-->[p1]-->[p2]-->[p3]-->[p4]-->

Now thread 1 is the observing thread, it is travelling and do
something with the nodes. thread 2 deletes [p1], thread 3
add_unique [p1'] with the same key as [p1]

thread 1 thread 2 thread 3
---------------------------------------------------
do something with [p1]
do something with [p2]
delete [p1]
uniquely add [p1']
(-->[p2]-->[p3]-->[p4]-->[p1']-->)
do something with [p3]
do something with [p4]
do something with [p1']
---------------------------------------------------

Now, thread 1 unexpectly handles the same key twice.
It is BUG!

If we just provide snapshot semantic, it is not useful.

So we need to provide more strict add_replace/add_unique semantic.
1) no duplicated keys should ever be observable in the table(snapshot semantic)
2) no duplicated keys should ever be observed by forward iteration in the table.

The fix:
To provide forward-iteration-observation semantic, I ensure the new inserted
node(add_unique/add_replace) is inserted as the first node of
the identical-hash-value node chain.

A little another behavior is changed in this patch, we will no do gc in
cds_lfht_next_duplicate(), because it does need.

[ Note by Mathieu Desnoyers:

I agree that your semantic fix is needed for ensuring that cds_lfht_next
is semantically correct with add_unique semantic.

Just a note: the most important lookup/get next API semantic in my view
is the lookup + cds_lfht_next_duplicate, which is the typical use case
for looking up and node and getting all the duplicate keys.

Ideally, we want both get_next and get_next_duplicate to provide the
correct semantic.

I think the reason your fix here seems to work and not break the
behavior of cds_lfht_next_duplicate is because you only put nodes added
with add_unique at the beginning of the same-hash-value-chain. It's a
good thing that you don't try doing this for other add mode (allowing
duplicates), because cds_lfht_next_duplicate requires duplicate nodes to
be next one to another. And you patch keeps this behavior.

]

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Cleanup order semantic

[ Edit by Mathieu Desnoyers: renamed "end_order" to "last_order", to
  match the "first_order" inclusive semantic. Normally, "end" excludes
  the range limit value, but "last" includes it. We use an inclusive
  range end value here. ]

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Comment cleanup: fix ascii art

Fix an incorrect arrow in ascii art description of the table.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Cleanup _cds_lfht_del()

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Cleanup _cds_lfht_replace()

[ Edit by Mathieu Desnoyers: re-inserted a comment. Edit title. ]

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Remove dead code in _cds_lfht_gc_bucket()

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Move replace code out from _cds_lfht_add()

Original patch from Lai Jiangshan, reworked significantly to keep the
iterator semantic, where a "next" node is never re-read after being
looked up within a RCU read-side critical section after it has been
validated.

Although strictly speaking the "replace" code re-checks that the next
node is not logically removed with a cmpxchg, I prefer to ensure that
all lookup paths behave similarly. It will make it easier to track
behavior later on if they all follow the same rules.

Reported-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Rename the parameter name of _cds_lfht_replace()

Although _cds_lfht_replace() is not a plublic API,
but a proper name will help for reading or maintainance.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix dummy node insertion bug

dummy node is the first node of the identical-hash-value chain

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

compare hash value before call compare_fct()

[ Edit by Mathieu Desnoyers:

  This is an optimisation that checks if the reverse hash value is
  equal before calling the comparison function. Given comparing a
  reverse hash is much faster than comparison, this accelarates the
  lookups and add. ]

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: Simplify lookup_bucket()

They are the same, but I don't think the compiler can optimize it.

And it also helps for understanding the following code.

[ Edit by Mathieu Desnoyers:
  - Add a comment that describes the equivalence between get_count_order
    and fls for this lookup of index + 1. ]

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: avoid unneed garbage collect

[ Edit by Mathieu Desnoyers:

If we have a concurrent removal executing while the add is performed,
I just want to ensure we agree that this scenario will be correct:

1) removal succeeds. We have flagged
   a node as "logically removed", but
   it is still in the linked list.

2) garbage collection is initiated.

                                        3) add succeeds. We insert a
                                           node with reverse hash value
                                           higher than the logically
                                           removed node. This means the
                                           add takes care of garbage
                                           collecting the logically
                                           removed node prior to adding
                                           the new node.

4) garbage collection of logically
   removed node fails
   (we ignore the return value of
    (void) uatomic_cmpxchg(&iter_prev->p.next, iter, new_next);)
   retry and iterate until we find the reverse
   hash value higher than the logically
   remove node.

So I think this is OK: given that the add path takes care of garbage
collecting any logically removed node located prior to the insert
position, we don't need to perform gargage collection after the
insertion. ]

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: merge duplicated code for bucket lookup

[ Edit by Mathieu Desnoyers: also remove unnecessary lookups that end up
  returning an already looked up node. Same behavior is guaranteed
  because the hash and size stay invariant across retry. ]

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: make struct rcu_level size power of 2

By adding a small slowpath overhead (added synchronize_rcu call in the
last iteration of the resize), we can reduce the amount of wasted memory
for memory allocators that allocate power of two memory areas. This is
achieved by removing the call_rcu head from struct rcu_level.

[ Edit by Mathieu Desnoyers:
  - add comment about need to manually update the allocation size of
    fields are added to struct rcu_level.
  - create a more explanatory title and changelog. ]

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Reinsert missing test_urcu_*.c files (missing in rename)

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Reinsert missing test_urcu_*.c files (missing in rename)

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: simplify get_count_order()

[ Edit by Mathieu Desnoyers:

- Updated comments.
- Quick benchmark on Intel(R) Atom(TM) CPU Z520   @ 1.33GHz:

get_count_order_ulong, from 0 to 100000000:

previous:  3.840s
new:       3.187s

- Test comparing bit-exactness for ranges near 0:

/*
 * fls: returns the position of the most significant bit.
 * Returns 0 if no bit is set, else returns the position of the most
 * significant bit (from 1 to 32 on 32-bit, from 1 to 64 on 64-bit).
 */
static inline
unsigned int fls_u32(uint32_t x)
{
int r;

asm("bsrl %1,%0\n\t"
    "jnz 1f\n\t"
    "movl $-1,%0\n\t"
    "1:\n\t"
    : "=r" (r) : "rm" (x));
return r + 1;
}

static inline
unsigned int fls_u64(uint64_t x)
{
long r;

asm("bsrq %1,%0\n\t"
    "jnz 1f\n\t"
    "movq $-1,%0\n\t"
    "1:\n\t"
    : "=r" (r) : "rm" (x));
return r + 1;
}

static __attribute__((unused))
unsigned int fls_u64(uint64_t x)
{
unsigned int r = 64;

if (!x)
return 0;

if (!(x & 0xFFFFFFFF00000000ULL)) {
x <<= 32;
r -= 32;
}
if (!(x & 0xFFFF000000000000ULL)) {
x <<= 16;
r -= 16;
}
if (!(x & 0xFF00000000000000ULL)) {
x <<= 8;
r -= 8;
}
if (!(x & 0xF000000000000000ULL)) {
x <<= 4;
r -= 4;
}
if (!(x & 0xC000000000000000ULL)) {
x <<= 2;
r -= 2;
}
if (!(x & 0x8000000000000000ULL)) {
x <<= 1;
r -= 1;
}
return r;
}

static __attribute__((unused))
unsigned int fls_u32(uint32_t x)
{
unsigned int r = 32;

if (!x)
return 0;
if (!(x & 0xFFFF0000U)) {
x <<= 16;
r -= 16;
}
if (!(x & 0xFF000000U)) {
x <<= 8;
r -= 8;
}
if (!(x & 0xF0000000U)) {
x <<= 4;
r -= 4;
}
if (!(x & 0xC0000000U)) {
x <<= 2;
r -= 2;
}
if (!(x & 0x80000000U)) {
x <<= 1;
r -= 1;
}
return r;
}

unsigned int fls_ulong(unsigned long x)
{
return fls_u32(x);
return fls_u64(x);
}

int get_count_order_u32(uint32_t x)
{
int order;

order = fls_u32(x) - 1;
if (x & (x - 1))
order++;
return order;
}

int get_count_order_ulong(unsigned long x)
{
int order;

order = fls_ulong(x) - 1;
if (x & (x - 1))
order++;
return order;
}

int test_get_count_order_u32(uint32_t x)
{
if (!x)
return -1;
return fls_u32(x - 1);
}

/* find the minimum order that x <= (1UL << order) */
int test_get_count_order_ulong(unsigned long x)
{
if (!x)
return -1;
return fls_ulong(x - 1);
}

int main(int argc, char **argv)
{
unsigned long i;

for (i = 0UL; i < 10000; i++) {
if (get_count_order_ulong(i) != test_get_count_order_ulong(i))
printf("Error for %lu\n", i);
}

for (i = 4294967293UL; i != 0; i++) {
if (get_count_order_ulong(i) != test_get_count_order_ulong(i))
printf("Error for %lu\n", i);
}

return 0;
}

]

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: use dbg_printf() for grow/shrink printout

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: merge thread_id into struct partition_resize_work

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rculfhash: remove unused rcu_head in partition_resize_work

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

rename test_qsbr to test_urcu_qsbr

[ edit by Mathieu Desnoyers: update runtests*.sh scripts accordingly ]

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>