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madvise after mirroring to control the RSS

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This commit is contained in:
Alex Young
2012-12-28 11:38:54 +00:00
parent 00d7237f66
commit f002b8ca1f
1 changed files with 15 additions and 5 deletions
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20
src/mirror.c
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@@ -30,6 +30,7 @@
#include <string.h>
#include <sys/un.h>
#include <unistd.h>
#include <sys/mman.h>
struct mirror * mirror_alloc(
union mysockaddr * connect_to,
@@ -151,10 +152,11 @@ static const unsigned int mirror_last_pass_after_bytes_written = 100<<20;
*/
static const int mirror_maximum_passes = 7;
/* A single mirror pass over the disc, optionally locking IO around the
* transfer.
*/
int mirror_pass(struct server * serve, int should_lock, uint64_t *written)
int mirror_pass(struct server * serve, int is_last_pass, uint64_t *written)
{
uint64_t current = 0;
int success = 1;
@@ -179,7 +181,7 @@ int mirror_pass(struct server * serve, int should_lock, uint64_t *written)
* is likely to slow things down but will be
* safe.
*/
if (should_lock) { server_lock_io( serve ); }
if (!is_last_pass) { server_lock_io( serve ); }
{
debug("in lock block");
/** FIXME: do something useful with bytes/second */
@@ -191,12 +193,15 @@ int mirror_pass(struct server * serve, int should_lock, uint64_t *written)
0,
serve->mirror->mapped + current,
MS_REQUEST_LIMIT_SECS);
madvise( serve->mirror->mapped + current,
run,
MADV_DONTNEED );
/* now mark it clean */
bitset_clear_range(map, current, run);
debug("leaving lock block");
}
if (should_lock) { server_unlock_io( serve ); }
if (!is_last_pass) { server_unlock_io( serve ); }
*written += run;
}
@@ -209,6 +214,10 @@ int mirror_pass(struct server * serve, int should_lock, uint64_t *written)
}
}
if ( !success ) {
madvise( serve->mirror->mapped, serve->size, MADV_NORMAL );
}
return success;
}
@@ -329,6 +338,7 @@ int mirror_should_quit( struct mirror * mirror )
}
}
void mirror_run( struct server *serve )
{
NULLCHECK( serve );
@@ -341,7 +351,7 @@ void mirror_run( struct server *serve )
for (pass=0; pass < mirror_maximum_passes-1; pass++) {
debug("mirror start pass=%d", pass);
if ( !mirror_pass( serve, 1, &written ) ){
if ( !mirror_pass( serve, 0, &written ) ){
debug("Failed mirror pass state is %d", mirror_get_state( serve->mirror ) );
debug("pass failed, giving up");
return; }
@@ -352,7 +362,7 @@ void mirror_run( struct server *serve )
server_lock_io( serve );
{
if ( mirror_pass( serve, 0, &written ) &&
if ( mirror_pass( serve, 1, &written ) &&
mirror_should_quit( serve->mirror ) ) {
debug("exit!");
mirror_on_exit( serve );