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uplex-varnish
unique-xids
Commits
676064df
Commit
676064df
authored
Dec 21, 2011
by
Poul-Henning Kamp
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Add timeouts and comprehensive test-case for memorypool gymnastics.
parent
8313da8d
Changes
2
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Showing
2 changed files
with
71 additions
and
8 deletions
+71
-8
cache_mempool.c
bin/varnishd/cache/cache_mempool.c
+42
-8
c00050.vtc
bin/varnishtest/tests/c00050.vtc
+29
-0
No files found.
bin/varnishd/cache/cache_mempool.c
View file @
676064df
...
...
@@ -42,14 +42,17 @@ struct memitem {
#define MEMITEM_MAGIC 0x42e55401
VTAILQ_ENTRY
(
memitem
)
list
;
unsigned
size
;
double
payload
;
double
touched
;
char
payload
;
};
VTAILQ_HEAD
(
memhead_s
,
memitem
);
struct
mempool
{
unsigned
magic
;
#define MEMPOOL_MAGIC 0x37a75a8d
VTAILQ_HEAD
(,
memitem
)
list
;
VTAILQ_HEAD
(,
memitem
)
surplus
;
struct
memhead_s
list
;
struct
memhead_s
surplus
;
struct
lock
*
mtx
;
struct
lock
imtx
;
const
char
*
name
;
...
...
@@ -58,6 +61,7 @@ struct mempool {
struct
VSC_C_mempool
*
vsc
;
unsigned
n_pool
;
pthread_t
thread
;
double
t_now
;
};
/*---------------------------------------------------------------------
...
...
@@ -81,21 +85,26 @@ mpl_alloc(const struct mempool *mpl)
/*---------------------------------------------------------------------
* Pool-guard
* Attempt to keep number of free items in pool inside bounds with
* minimum locking activity.
* minimum locking activity, and keep an eye on items at the tail
* of the list not getting too old.
*/
#include <stdio.h>
static
void
*
mpl_guard
(
void
*
priv
)
{
struct
mempool
*
mpl
;
struct
memitem
*
mi
=
NULL
;
double
mpl_slp
__state_variable__
(
mpl_slp
);
double
last
=
0
;
CAST_OBJ_NOTNULL
(
mpl
,
priv
,
MEMPOOL_MAGIC
);
mpl_slp
=
0
.
15
;
// random
while
(
1
)
{
VTIM_sleep
(
mpl_slp
);
mpl_slp
=
0
.
814
;
// random
mpl
->
t_now
=
VTIM_real
();
if
(
mi
!=
NULL
&&
(
mpl
->
n_pool
>
mpl
->
param
->
max_pool
||
mi
->
size
<
*
mpl
->
cur_size
))
{
...
...
@@ -106,45 +115,69 @@ mpl_guard(void *priv)
if
(
mi
==
NULL
&&
mpl
->
n_pool
<
mpl
->
param
->
min_pool
)
mi
=
mpl_alloc
(
mpl
);
if
(
mpl
->
n_pool
<
mpl
->
param
->
min_pool
&&
mi
!=
NULL
)
{
/* can do */
}
else
if
(
mpl
->
n_pool
>
mpl
->
param
->
max_pool
&&
mi
==
NULL
)
{
/* can do */
}
else
if
(
!
VTAILQ_EMPTY
(
&
mpl
->
surplus
))
{
/* can do */
}
else
if
(
last
+
.
1
*
mpl
->
param
->
max_age
<
mpl
->
t_now
)
{
/* should do */
}
else
{
continue
;
/*
cannot
do */
continue
;
/*
nothing to
do */
}
mpl_slp
=
0
.
314
;
mpl_slp
=
0
.
314
;
// random
if
(
Lck_Trylock
(
mpl
->
mtx
))
continue
;
mpl_slp
=
.
01
;
if
(
mpl
->
n_pool
<
mpl
->
param
->
min_pool
&&
mi
!=
NULL
&&
mi
->
size
>=
*
mpl
->
cur_size
)
{
CHECK_OBJ_NOTNULL
(
mi
,
MEMITEM_MAGIC
);
mpl
->
vsc
->
pool
++
;
mpl
->
n_pool
++
;
mi
->
touched
=
mpl
->
t_now
;
VTAILQ_INSERT_HEAD
(
&
mpl
->
list
,
mi
,
list
);
mi
=
NULL
;
mpl_slp
=
.
01
;
// random
}
if
(
mpl
->
n_pool
>
mpl
->
param
->
max_pool
&&
mi
==
NULL
)
{
mi
=
VTAILQ_FIRST
(
&
mpl
->
list
);
CHECK_OBJ_NOTNULL
(
mi
,
MEMITEM_MAGIC
);
mpl
->
vsc
->
pool
--
;
mpl
->
vsc
->
surplus
++
;
mpl
->
n_pool
--
;
VTAILQ_REMOVE
(
&
mpl
->
list
,
mi
,
list
);
mpl_slp
=
.
01
;
// random
}
if
(
mi
==
NULL
)
{
mi
=
VTAILQ_FIRST
(
&
mpl
->
surplus
);
if
(
mi
!=
NULL
)
{
CHECK_OBJ_NOTNULL
(
mi
,
MEMITEM_MAGIC
);
VTAILQ_REMOVE
(
&
mpl
->
surplus
,
mi
,
list
);
mpl_slp
=
.
01
;
// random
}
}
if
(
mi
==
NULL
&&
mpl
->
n_pool
>
mpl
->
param
->
min_pool
)
{
mi
=
VTAILQ_LAST
(
&
mpl
->
list
,
memhead_s
);
CHECK_OBJ_NOTNULL
(
mi
,
MEMITEM_MAGIC
);
if
(
mi
->
touched
+
mpl
->
param
->
max_age
<
mpl
->
t_now
)
{
mpl
->
vsc
->
pool
--
;
mpl
->
vsc
->
timeout
++
;
mpl
->
n_pool
--
;
VTAILQ_REMOVE
(
&
mpl
->
list
,
mi
,
list
);
mpl_slp
=
.
01
;
// random
}
else
{
mi
=
NULL
;
last
=
mpl
->
t_now
;
}
}
else
if
(
mpl
->
n_pool
<=
mpl
->
param
->
min_pool
)
{
last
=
mpl
->
t_now
;
}
Lck_Unlock
(
mpl
->
mtx
);
if
(
mi
!=
NULL
)
{
...
...
@@ -250,6 +283,7 @@ MPL_Free(struct mempool *mpl, void *item)
}
else
{
mpl
->
vsc
->
pool
++
;
mpl
->
n_pool
++
;
mi
->
touched
=
mpl
->
t_now
;
VTAILQ_INSERT_HEAD
(
&
mpl
->
list
,
mi
,
list
);
}
...
...
bin/varnishtest/tests/c00050.vtc
0 → 100644
View file @
676064df
varnishtest "Memory pool gymnastics"
server s1 { } -start
varnish v1 -vcl+backend {} -start
delay 1
varnish v1 -expect MEMPOOL.vbc.pool == 10
varnish v1 -cliok "param.set vbc_pool 90,100,100"
delay 1
varnish v1 -expect MEMPOOL.vbc.pool == 90
varnish v1 -cliok "param.set vbc_pool 50,80,100"
delay 1
varnish v1 -expect MEMPOOL.vbc.pool == 80
varnish v1 -expect MEMPOOL.vbc.surplus == 10
varnish v1 -cliok "param.set vbc_pool 10,80,1"
delay 1
varnish v1 -expect MEMPOOL.vbc.pool == 10
varnish v1 -expect MEMPOOL.vbc.timeout == 70
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