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User friendly bit mask display for DCB print; monitors to work via inserting hangups instead of callbacks.

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This commit is contained in:
counterpoint
2015-10-17 20:00:05 +01:00
parent 57f5dd15bc
commit 482db5e84d
7 changed files with 152 additions and 14 deletions
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20
server/core/dcb.c
View File

@ -58,6 +58,7 @@
* 04/09/2015 Martin Brampton Changes to ensure DCB always has session pointer
* 28/09/2015 Martin Brampton Add counters, maxima for DCBs and zombies
* 29/05/2015 Martin Brampton Impose locking in dcb_call_foreach callbacks
* 17/10/2015 Martin Brampton Add hangup for each and bitmask display MaxAdmin
*
* @endverbatim
*/
@ -544,6 +545,7 @@ dcb_process_victim_queue(DCB *listofdcb)
/*<
* Stop dcb's listening and modify state accordingly.
*/
spinlock_acquire(&dcb->dcb_initlock);
if (dcb->state == DCB_STATE_POLLING || dcb->state == DCB_STATE_LISTENING)
{
if (dcb->state == DCB_STATE_LISTENING)
@ -560,6 +562,7 @@ dcb_process_victim_queue(DCB *listofdcb)
}
else {
/* Must be DCB_STATE_POLLING */
spinlock_release(&dcb->dcb_initlock);
if (0 == dcb->persistentstart && dcb_maybe_add_persistent(dcb))
{
/* Have taken DCB into persistent pool, no further killing */
@ -635,6 +638,7 @@ dcb_process_victim_queue(DCB *listofdcb)
dcb->state = DCB_STATE_DISCONNECTED;
nextdcb = dcb->memdata.next;
spinlock_release(&dcb->dcb_initlock);
dcb_final_free(dcb);
dcb = nextdcb;
}
@ -1831,7 +1835,10 @@ dcb_close(DCB *dcb)
/*< Set bit for each maxscale thread. This should be done before
* the state is changed, so as to protect the DCB from premature
* destruction. */
bitmask_copy(&dcb->memdata.bitmask, poll_bitmask());
if (dcb->server)
{
bitmask_copy(&dcb->memdata.bitmask, poll_bitmask());
}
}
spinlock_release(&zombiespin);
}
@ -2036,6 +2043,15 @@ dprintOneDCB(DCB *pdcb, DCB *dcb)
dcb_printf(pdcb, "\tRole: %s\n", rolename);
free(rolename);
}
if (!bitmask_isallclear(&dcb->memdata.bitmask))
{
char *bitmasktext = bitmask_render_readable(&dcb->memdata.bitmask);
if (bitmasktext)
{
dcb_printf(pdcb, "\tBitMask: %s\n", bitmasktext);
free(bitmasktext);
}
}
dcb_printf(pdcb, "\tStatistics:\n");
dcb_printf(pdcb, "\t\tNo. of Reads: %d\n", dcb->stats.n_reads);
dcb_printf(pdcb, "\t\tNo. of Writes: %d\n", dcb->stats.n_writes);
@ -2245,7 +2261,7 @@ gw_dcb_state2string (int state)
case DCB_STATE_POLLING:
return "DCB in the polling loop";
case DCB_STATE_NOPOLLING:
return "DCB not in the polling loop";
return "DCB not in polling loop";
case DCB_STATE_LISTENING:
return "DCB for listening socket";
case DCB_STATE_DISCONNECTED:

124
server/core/gwbitmask.c
View File

@ -17,6 +17,7 @@
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <gwbitmask.h>
/**
@ -47,10 +48,14 @@
* Date Who Description
* 28/06/13 Mark Riddoch Initial implementation
* 20/08/15 Martin Brampton Added caveats about limitations (above)
* 17/10/15 Martin Brampton Added display of bitmask
*
* @endverbatim
*/
static int bitmask_isset_without_spinlock(GWBITMASK *bitmask, int bit);
static int bitmask_count_bits_set(GWBITMASK *bitmask);
/**
* Initialise a bitmask
*
@ -151,19 +156,42 @@ unsigned char mask;
* Return a non-zero value if the bit at the specified bit
* position in the bitmask is set.
* The bitmask will automatically be extended if the bit is
* beyond the current bitmask length. This could be optimised
* by assuming that a bit beyond the length is unset.
* beyond the current bitmask length. The work is done in the function
* bitmask_isset_without_spinlock, which can be called when a spinlock
* has already been acquired.
*
* @param bitmask Pointer the bitmask
* @param bit Bit to clear
* @param bit Bit to test
*/
int
bitmask_isset(GWBITMASK *bitmask, int bit)
{
int result;
spinlock_acquire(&bitmask->lock);
result = bitmask_isset_without_spinlock(bitmask, bit);
spinlock_release(&bitmask->lock);
return result;
}
/**
* Return a non-zero value if the bit at the specified bit
* position in the bitmask is set. Should be called while holding a
* lock on the bitmask.
*
* The bitmask will automatically be extended if the bit is
* beyond the current bitmask length. This could be optimised
* by assuming that a bit beyond the length is unset.
*
* @param bitmask Pointer the bitmask
* @param bit Bit to test
*/
static int
bitmask_isset_without_spinlock(GWBITMASK *bitmask, int bit)
{
unsigned char *ptr;
unsigned char mask;
spinlock_acquire(&bitmask->lock);
if (bit >= bitmask->length)
{
bitmask->bits = realloc(bitmask->bits,
@ -174,7 +202,6 @@ unsigned char mask;
}
ptr = bitmask->bits + (bit / 8);
mask = 1 << (bit % 8);
spinlock_release(&bitmask->lock);
return *ptr & mask;
}
@ -239,3 +266,90 @@ bitmask_copy(GWBITMASK *dest, GWBITMASK *src)
spinlock_release(&src->lock);
}
/**
* Return a comma separated list of the numbers of the bits that are set in
* a bitmask, numbering starting at zero. Constrained to reject requests that
* could require more than three digit numbers. The returned string must be
* freed by the caller (unless it is null on account of memory allocation
* failure).
*
* @param bitmask Bitmap to make readable
* @return pointer to the newly allocated string, or null if no memory
*/
char *
bitmask_render_readable(GWBITMASK *bitmask)
{
char *toobig = "Bitmask is too large to render readable";
char *empty = "No bits are set";t
char onebit[5];
char *result;
int count_set = 0;
spinlock_acquire(&bitmask->lock);
if (999 < bitmask->length)
{
result = malloc(strlen(toobig));
if (result)
{
strcpy(result, toobig);
}
}
else
{
count_set = bitmask_count_bits_set(bitmask);
if (count_set)
{
result = malloc(1 + (4 * count_set));
if (result)
{
result[0] = 0;
for (int i = 0; i<bitmask->length; i++)
{
if (bitmask_isset_without_spinlock(bitmask, i))
{
sprintf(onebit, "%d,", i);
strcat(result, onebit);
}
}
result[strlen(result)-1] = 0;
}
}
else
{
result = malloc(strlen(empty));
if (result)
{
strcpy(result, empty);
}
}
}
spinlock_release(&bitmask->lock);
return result;
}
/**
* Return a count of the number of bits set in a bitmask. Helpful for setting
* the size of string needed to show the set bits in readable form.
*
* @param bitmask Bitmap whose bits are to be counted
* @return int Number of set bits
*/
static int
bitmask_count_bits_set(GWBITMASK *bitmask)
{
const unsigned char oneBits[] = {0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4};
unsigned char partresults;
int result = 0;
unsigned char *ptr, *eptr;
ptr = bitmask->bits;
eptr = ptr + (bitmask->length / 8);
while (ptr < eptr)
{
partresults = oneBits[*ptr&0x0f];
partresults += oneBits[*ptr>>4];
result += partresults;
ptr++;
}
return result;
}

3
server/include/gwbitmask.h
View File

@ -27,6 +27,7 @@
*
* Date Who Description
* 28/06/13 Mark Riddoch Initial implementation
* 17/10/15 Martin Brampton Add bitmask_render_readable
*
* @endverbatim
*/
@ -51,4 +52,6 @@ extern void bitmask_clear(GWBITMASK *, int);
extern int bitmask_isset(GWBITMASK *, int);
extern int bitmask_isallclear(GWBITMASK *);
extern void bitmask_copy(GWBITMASK *, GWBITMASK *);
extern char *bitmask_render_readable(GWBITMASK *bitmask);
#endif

7
server/include/poll.h
View File

@ -29,6 +29,7 @@
*
* Date Who Description
* 19/06/13 Mark Riddoch Initial implementation
* 17/10/15 Martin Brampton Declare fake event functions
*
* @endverbatim
*/
@ -60,9 +61,11 @@ extern void poll_set_maxwait(unsigned int);
extern void poll_set_nonblocking_polls(unsigned int);
extern void dprintPollStats(DCB *);
extern void dShowThreads(DCB *dcb);
void poll_add_epollin_event_to_dcb(DCB* dcb, GWBUF* buf);
void poll_add_epollin_event_to_dcb(DCB* dcb, GWBUF* buf);
extern void dShowEventQ(DCB *dcb);
extern void dShowEventStats(DCB *dcb);
extern int poll_get_stat(POLL_STAT stat);
extern int poll_get_stat(POLL_STAT stat);
extern RESULTSET *eventTimesGetList();
extern void poll_fake_hangup_event(DCB *dcb);
extern void poll_fake_write_event(DCB *dcb);
#endif

5
server/modules/monitor/galeramon.c
View File

@ -35,6 +35,7 @@
* 20/04/15 Guillaume Lefranc Added availableWhenDonor feature
* 22/04/15 Martin Brampton Addition of disableMasterRoleSetting
* 08/05/15 Markus Makela Addition of launchable scripts
* 17/10/15 Martin Brampton Change DCB callback to hangup
*
* @endverbatim
*/
@ -541,13 +542,13 @@ monitor_event_t evtype;
if (!(SERVER_IS_RUNNING(ptr->server)) ||
!(SERVER_IS_IN_CLUSTER(ptr->server)))
{
dcb_call_foreach(ptr->server,DCB_REASON_NOT_RESPONDING);
dcb_hangup_foreach(ptr->server);
}
if (SERVER_IS_DOWN(ptr->server))
{
/** Increase this server'e error count */
dcb_call_foreach(ptr->server,DCB_REASON_NOT_RESPONDING);
dcb_hangup_foreach(ptr->server);
ptr->mon_err_count += 1;
}

3
server/modules/monitor/mmmon.c
View File

@ -25,6 +25,7 @@
* Date Who Description
* 08/09/14 Massimiliano Pinto Initial implementation
* 08/05/15 Markus Makela Addition of launchable scripts
* 17/10/15 Martin Brampton Change DCB callback to hangup
*
* @endverbatim
*/
@ -625,7 +626,7 @@ detect_stale_master = handle->detectStaleMaster;
if (mon_status_changed(ptr))
{
dcb_call_foreach(ptr->server,DCB_REASON_NOT_RESPONDING);
dcb_hangup_foreach(ptr->server);
}
if (mon_status_changed(ptr) ||

4
server/modules/monitor/mysql_mon.c
View File

@ -47,6 +47,7 @@
* 18/11/14 Massimiliano Pinto One server only in configuration becomes master.
* servers=server1 must be present in mysql_mon and in router sections as well.
* 08/05/15 Markus Makela Added launchable scripts
* 17/10/15 Martin Brampton Change DCB callback to hangup
*
* @endverbatim
*/
@ -861,8 +862,7 @@ detect_stale_master = handle->detectStaleMaster;
if (!(SERVER_IS_RUNNING(ptr->server)) ||
!(SERVER_IS_IN_CLUSTER(ptr->server)))
{
dcb_call_foreach(ptr->server,DCB_REASON_NOT_RESPONDING);
dcb_hangup_foreach(ptr->server);
}