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Better default bucket size

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This commit is contained in:
Kent Overstreet 2015-03-30 01:53:30 -07:00
parent e13d21ade7
commit da1fff8700
1 changed files with 42 additions and 13 deletions
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55
bcacheadm-format.c
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@ -58,9 +58,7 @@ static size_t nr_backing_devices = 0, nr_cache_devices = 0;
static char *label = NULL;
/* All in units of 512 byte sectors */
static unsigned block_size;
static unsigned bucket_size = 2048;
static unsigned btree_node_size;
static unsigned block_size, bucket_size, btree_node_size;
static uint64_t filesystem_size;
static unsigned tier, replacement_policy;
@ -76,6 +74,7 @@ static unsigned cache_mode = CACHE_MODE_WRITEBACK;
static int set_cache(NihOption *option, const char *arg)
{
cache_devices[nr_cache_devices++] = (struct cache_opts) {
.fd = dev_open(arg),
.dev = strdup(arg),
.bucket_size = bucket_size,
.tier = tier,
@ -89,6 +88,7 @@ static int set_cache(NihOption *option, const char *arg)
static int set_bdev(NihOption *option, const char *arg)
{
backing_devices[nr_backing_devices++] = (struct backingdev_opts) {
.fd = dev_open(arg),
.dev = strdup(arg),
.label = strdup(label),
};
@ -235,6 +235,30 @@ NihOption bcacheadm_format_options[] = {
NIH_OPTION_LAST
};
static unsigned rounddown_pow_of_two(unsigned n)
{
unsigned ret;
do {
ret = n;
n &= n - 1;
} while (n);
return ret;
}
static unsigned ilog2(uint64_t n)
{
unsigned ret = 0;
while (n) {
ret++;
n >>= 1;
}
return ret;
}
int bcacheadm_format(NihCommand *command, char *const *args)
{
struct cache_sb *cache_set_sb;
@ -242,16 +266,6 @@ int bcacheadm_format(NihCommand *command, char *const *args)
if (!nr_cache_devices && !nr_backing_devices)
die("Please supply a device");
for (struct cache_opts *i = cache_devices;
i < cache_devices + nr_cache_devices;
i++)
i->fd = dev_open(i->dev);
for (struct backingdev_opts *i = backing_devices;
i < backing_devices + nr_backing_devices;
i++)
i->fd = dev_open(i->dev);
if (!block_size) {
for (struct cache_opts *i = cache_devices;
i < cache_devices + nr_cache_devices;
@ -264,7 +278,22 @@ int bcacheadm_format(NihCommand *command, char *const *args)
block_size = max(block_size, get_blocksize(i->dev, i->fd));
}
for (struct cache_opts *i = cache_devices;
i < cache_devices + nr_cache_devices;
i++)
if (!i->bucket_size) {
uint64_t size = (i->filesystem_size ?:
getblocks(i->fd)) << 9;
if (size < 1 << 20) /* 1M device - 256 4k buckets*/
i->bucket_size = rounddown_pow_of_two(size >> 17);
else
/* Max 1M bucket at around 256G */
i->bucket_size = 8 << min((ilog2(size >> 20) / 2), 9U);
}
if (!btree_node_size) {
/* 256k default btree node size */
btree_node_size = 512;
for (struct cache_opts *i = cache_devices;