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authorMohit Agrawal <moagrawa@redhat.com>2017-10-20 12:39:29 +0530
committerAmar Tumballi <amarts@redhat.com>2017-12-12 09:05:56 +0000
commit430484c92ab5a6234958d1143e0bb14aeb0cd1c0 (patch)
tree0fb39e2a1c9be94396736d76b9aaababf232821b /xlators/protocol/client/src/client-handshake.c
parent8483ed87165c1695b513e223549d33d2d63891d9 (diff)
glusterfs: Use gcc builtin ATOMIC operator to increase/decreate refcount.
Problem: In glusterfs code base we call mutex_lock/unlock to take reference/dereference for a object.Sometime it could be reason for lock contention also. Solution: There is no need to use mutex to increase/decrease ref counter, instead of using mutex use gcc builtin ATOMIC operation. Test: I have not observed yet how much performance gain after apply this patch specific to glusterfs but i have tested same with below small program(mutex and atomic both) and get good difference. static int numOuterLoops; static void * threadFunc(void *arg) { int j; for (j = 0; j < numOuterLoops; j++) { __atomic_add_fetch (&glob, 1,__ATOMIC_ACQ_REL); } return NULL; } int main(int argc, char *argv[]) { int opt, s, j; int numThreads; pthread_t *thread; int verbose; int64_t n = 0; if (argc < 2 ) { printf(" Please provide 2 args Num of threads && Outer Loop\n"); exit (-1); } numThreads = atoi(argv[1]); numOuterLoops = atoi (argv[2]); if (1) { printf("\tthreads: %d; outer loops: %d;\n", numThreads, numOuterLoops); } thread = calloc(numThreads, sizeof(pthread_t)); if (thread == NULL) { printf ("calloc error so exit\n"); exit (-1); } __atomic_store (&glob, &n, __ATOMIC_RELEASE); for (j = 0; j < numThreads; j++) { s = pthread_create(&thread[j], NULL, threadFunc, NULL); if (s != 0) { printf ("pthread_create failed so exit\n"); exit (-1); } } for (j = 0; j < numThreads; j++) { s = pthread_join(thread[j], NULL); if (s != 0) { printf ("pthread_join failed so exit\n"); exit (-1); } } printf("glob value is %ld\n",__atomic_load_n (&glob,__ATOMIC_RELAXED)); exit(0); } time ./thr_count 800 800000 threads: 800; outer loops: 800000; glob value is 640000000 real 1m10.288s user 0m57.269s sys 3m31.565s time ./thr_count_atomic 800 800000 threads: 800; outer loops: 800000; glob value is 640000000 real 0m20.313s user 1m20.558s sys 0m0.028 Change-Id: Ie5030a52ea264875e002e108dd4b207b15ab7cc7 Signed-off-by: Mohit Agrawal <moagrawa@redhat.com>
Diffstat (limited to 'xlators/protocol/client/src/client-handshake.c')
-rw-r--r--xlators/protocol/client/src/client-handshake.c16
1 files changed, 4 insertions, 12 deletions
diff --git a/xlators/protocol/client/src/client-handshake.c b/xlators/protocol/client/src/client-handshake.c
index ca3d140..6429dc2 100644
--- a/xlators/protocol/client/src/client-handshake.c
+++ b/xlators/protocol/client/src/client-handshake.c
@@ -32,7 +32,7 @@ int client_set_lk_version_cbk (struct rpc_req *req, struct iovec *iov,
int client_set_lk_version (xlator_t *this);
typedef struct client_fd_lk_local {
- int ref;
+ gf_atomic_t ref;
gf_boolean_t error;
gf_lock_t lock;
clnt_fd_ctx_t *fdctx;
@@ -285,11 +285,7 @@ clnt_fd_lk_local_ref (xlator_t *this, clnt_fd_lk_local_t *local)
{
GF_VALIDATE_OR_GOTO (this->name, local, out);
- LOCK (&local->lock);
- {
- local->ref++;
- }
- UNLOCK (&local->lock);
+ GF_ATOMIC_INC (local->ref);
out:
return local;
}
@@ -301,11 +297,7 @@ clnt_fd_lk_local_unref (xlator_t *this, clnt_fd_lk_local_t *local)
GF_VALIDATE_OR_GOTO (this->name, local, out);
- LOCK (&local->lock);
- {
- ref = --local->ref;
- }
- UNLOCK (&local->lock);
+ ref = GF_ATOMIC_DEC (local->ref);
if (ref == 0) {
LOCK_DESTROY (&local->lock);
@@ -325,7 +317,7 @@ clnt_fd_lk_local_create (clnt_fd_ctx_t *fdctx)
if (!local)
goto out;
- local->ref = 1;
+ GF_ATOMIC_INIT (local->ref, 1);
local->error = _gf_false;
local->fdctx = fdctx;