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authorRick Reed <[email protected]>2012-03-16 10:14:32 -0700
committerSverker Eriksson <[email protected]>2012-06-18 11:39:42 +0200
commit0ed14ae2c365bc7f37442902e389f4f75f44aa94 (patch)
treea0df351561c362ebb37d0541bba3d6215cb036ee /erts/emulator/sys/common/erl_poll.c
parentea31957b8c32dda844ecf690878687996830bb84 (diff)
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Make allocation of check_io tables more scalable.
Diffstat (limited to 'erts/emulator/sys/common/erl_poll.c')
-rw-r--r--erts/emulator/sys/common/erl_poll.c32
1 files changed, 27 insertions, 5 deletions
diff --git a/erts/emulator/sys/common/erl_poll.c b/erts/emulator/sys/common/erl_poll.c
index 26858052c4..5a8588351d 100644
--- a/erts/emulator/sys/common/erl_poll.c
+++ b/erts/emulator/sys/common/erl_poll.c
@@ -105,8 +105,8 @@
#define ERTS_POLL_COALESCE_KP_RES (ERTS_POLL_USE_KQUEUE || ERTS_POLL_USE_EPOLL)
-#define FDS_STATUS_EXTRA_FREE_SIZE 128
-#define POLL_FDS_EXTRA_FREE_SIZE 128
+#define ERTS_EV_TABLE_MIN_LENGTH 1024
+#define ERTS_EV_TABLE_EXP_THRESHOLD (2048*1024)
#ifdef ERTS_POLL_NEED_ASYNC_INTERRUPT_SUPPORT
# define ERTS_POLL_ASYNC_INTERRUPT_SUPPORT 1
@@ -563,6 +563,28 @@ free_update_requests_block(ErtsPollSet ps,
* --- Growing poll set structures -------------------------------------------
*/
+int
+ERTS_POLL_EXPORT(erts_poll_get_table_len) (int new_len)
+{
+ if (new_len < ERTS_EV_TABLE_MIN_LENGTH) {
+ new_len = ERTS_EV_TABLE_MIN_LENGTH;
+ } else if (new_len < ERTS_EV_TABLE_EXP_THRESHOLD) {
+ /* find next power of 2 */
+ --new_len;
+ new_len |= new_len >> 1;
+ new_len |= new_len >> 2;
+ new_len |= new_len >> 4;
+ new_len |= new_len >> 8;
+ new_len |= new_len >> 16;
+ ++new_len;
+ } else {
+ /* grow incrementally */
+ new_len += ERTS_EV_TABLE_EXP_THRESHOLD;
+ }
+ return new_len;
+}
+
+
#if ERTS_POLL_USE_KERNEL_POLL
static void
grow_res_events(ErtsPollSet ps, int new_len)
@@ -575,7 +597,7 @@ grow_res_events(ErtsPollSet ps, int new_len)
#elif ERTS_POLL_USE_KQUEUE
struct kevent
#endif
- )*new_len;
+ ) * ERTS_POLL_EXPORT(erts_poll_get_table_len)(new_len);
/* We do not need to save previously stored data */
if (ps->res_events)
erts_free(ERTS_ALC_T_POLL_RES_EVS, ps->res_events);
@@ -589,7 +611,7 @@ static void
grow_poll_fds(ErtsPollSet ps, int min_ix)
{
int i;
- int new_len = min_ix + 1 + POLL_FDS_EXTRA_FREE_SIZE;
+ int new_len = ERTS_POLL_EXPORT(erts_poll_get_table_len)(min_ix + 1);
if (new_len > max_fds)
new_len = max_fds;
ps->poll_fds = (ps->poll_fds_len
@@ -611,7 +633,7 @@ static void
grow_fds_status(ErtsPollSet ps, int min_fd)
{
int i;
- int new_len = min_fd + 1 + FDS_STATUS_EXTRA_FREE_SIZE;
+ int new_len = ERTS_POLL_EXPORT(erts_poll_get_table_len)(min_fd + 1);
ASSERT(min_fd < max_fds);
if (new_len > max_fds)
new_len = max_fds;