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Release exactly all unused bytes in mmap allocation.

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erdgeist 2007-10-19 05:21:01 +00:00
parent 714ea1b88e
commit cab763d4ee
1 changed files with 14 additions and 10 deletions
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24
trackerlogic.c
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@ -302,10 +302,20 @@ size_t return_peers_for_torrent( ot_torrent *torrent, size_t amount, char *reply
return r - reply; return r - reply;
} }
/* Release memory we allocated too much */
static void fix_mmapallocation( void *buf, size_t old_alloc, size_t new_alloc ) {
int res, page_size = getpagesize();
size_t old_pages = 1 + old_alloc / page_size;
size_t new_pages = 1 + new_alloc / page_size;
if( old_pages != new_pages )
munmap( ((char*)buf) + new_pages * page_size, old_alloc - new_pages * page_size );
}
/* Fetch full scrape info for all torrents */ /* Fetch full scrape info for all torrents */
size_t return_fullscrape_for_tracker( char **reply ) { size_t return_fullscrape_for_tracker( char **reply ) {
size_t torrent_count = 0, j; size_t torrent_count = 0, j;
size_t allocated, replysize, usedpages; size_t allocated, replysize;
int i, k; int i, k;
char *r; char *r;
@ -338,17 +348,14 @@ size_t return_fullscrape_for_tracker( char **reply ) {
*r++='e'; *r++='e'; *r++='e'; *r++='e';
replysize = ( r - *reply ); replysize = ( r - *reply );
if( allocated > replysize ) { fix_mmapallocation( *reply, allocated, replysize );
usedpages = 1 + ( replysize / getpagesize() );
munmap( *reply + usedpages * getpagesize(), allocated - replysize );
}
return replysize; return replysize;
} }
size_t return_memstat_for_tracker( char **reply ) { size_t return_memstat_for_tracker( char **reply ) {
size_t torrent_count = 0, j; size_t torrent_count = 0, j;
size_t allocated, replysize, usedpages; size_t allocated, replysize;
int i, k; int i, k;
char *r; char *r;
@ -375,10 +382,7 @@ size_t return_memstat_for_tracker( char **reply ) {
} }
replysize = ( r - *reply ); replysize = ( r - *reply );
if( allocated > replysize ) { fix_mmapallocation( *reply, allocated, replysize );
usedpages = 1 + ( replysize / getpagesize() );
munmap( *reply + usedpages * getpagesize(), allocated - replysize );
}
return replysize; return replysize;
} }