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(trunk libT) #1521 "memory cache to reduce disk IO" -- improved revision from sadface

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This commit is contained in:
Charles Kerr 2010-07-01 17:09:13 +00:00
parent e6d136f724
commit 8961d095d7
1 changed files with 10 additions and 5 deletions
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15
libtransmission/cache.c
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@ -95,9 +95,8 @@ getBlockRun( const tr_cache * cache, int pos, struct run_info * info )
}
/* return the starting index of the longest contiguous run of blocks BUT:
* 1 - Length of run must be even.
* 2 - Run must begin with a even block.
* 3 - Oldest run is preferred.
* - Run should begin with a even block and length of run should be even.
* - Oldest run is preferred.
*/
static int
findChunk2Discard( tr_cache * cache, int * setme_n )
@ -107,7 +106,7 @@ findChunk2Discard( tr_cache * cache, int * setme_n )
int bestpos = 0;
unsigned bestlen = 1;
unsigned jump;
time_t oldest_time = ~0;
time_t oldest_time = tr_time() + 1;
struct run_info run;
for( pos=0; pos<n; pos+=jump )
@ -121,9 +120,15 @@ findChunk2Discard( tr_cache * cache, int * setme_n )
/* check alignment */
if( len % 2 == 0 ) {
if( !run.is_aligned )
if( !run.is_aligned ) {
/* Let it grow. Otherwise we contribute to fragmentation */
if( bestlen == 1) {
/* But if all other blocks are non-contiguous, we prefer this one */
bestpos = pos;
oldest_time = cache->maxBlocks - len;
}
continue;
}
} else {
if( len != 1 ) {
--len;