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Introduction of a new polling mechanism to make the thread usage more fair and avoid

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having busy DCB's being able to block execution of events on less busy DCBs
This commit is contained in:
Mark Riddoch
2014-09-24 16:34:34 +01:00
parent 7562d49a95
commit 92ce8a47ba
3 changed files with 394 additions and 358 deletions
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20
server/include/dcb.h
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@ -53,7 +53,8 @@ struct service;
* 07/02/2014 Massimiliano Pinto Added ipv4 data struct into for dcb
* 07/05/2014 Mark Riddoch Addition of callback mechanism
* 08/05/2014 Mark Riddoch Addition of writeq high and low watermarks
* 27/08/2014 Mark Ridddoch Addition of write event queuing
* 27/08/2014 Mark Riddoch Addition of write event queuing
* 23/09/2014 Mark Riddoch New poll processing queue
*
* @endverbatim
*/
@ -97,6 +98,14 @@ typedef struct gw_protocol {
int (*session)(struct dcb *, void *);
} GWPROTOCOL;
typedef struct {
struct dcb *next;
struct dcb *prev;
uint32_t pending_events;
int processing;
SPINLOCK eventqlock;
} DCBEVENTQ;
/**
* The GWPROTOCOL version data. The following should be updated whenever
* the GWPROTOCOL structure is changed. See the rules defined in modinfo.h
@ -114,10 +123,6 @@ typedef struct dcbstats {
int n_buffered; /*< Number of buffered writes */
int n_high_water; /*< Number of crosses of high water mark */
int n_low_water; /*< Number of crosses of low water mark */
int n_busypolls; /*< Number of read polls whiel reading */
int n_readrechecks; /*< Number of rechecks for reads */
int n_busywrpolls; /*< Number of write polls while writing */
int n_writerechecks;/*< Number of rechecks for writes */
} DCBSTATS;
/**
@ -204,6 +209,7 @@ typedef struct dcb {
#endif
dcb_role_t dcb_role;
SPINLOCK dcb_initlock;
DCBEVENTQ evq; /**< The event queue for this DCB */
#if 1
simple_mutex_t dcb_read_lock;
simple_mutex_t dcb_write_lock;
@ -271,8 +277,8 @@ int fail_accept_errno;
#define DCB_BELOW_LOW_WATER(x) ((x)->low_water && (x)->writeqlen < (x)->low_water)
#define DCB_ABOVE_HIGH_WATER(x) ((x)->high_water && (x)->writeqlen > (x)->high_water)
void dcb_pollin(DCB *, int, int);
void dcb_pollout(DCB *, int, int);
#define DCB_POLL_BUSY(x) ((x)->evq.next != NULL)
DCB *dcb_get_zombies(void);
int gw_write(
#if defined(SS_DEBUG)