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do a cyclic seek for unused memory objects in pool

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In non regular use cases allocated memory might stay persistent in memory
pool. This small patch checks every minute if there are old objects which
can be released from memory pool.

Right now with regular use, the pool is checked for old objects on each
allocation attempt from this pool. so basically polling by its use. Now
consider what happens if someone writes a lot of files and stops use of
the volume or even unmounts it. So the code will no longer check if
objects can be released from the pool. Already allocated objects will
still stay in pool cache. this is no big issue for common use. But
someone discovered this issue while doing tests. personally i know this
behavior and I'm aware of it. Its no big issue. just a enhancement

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Kjeld Schouten-Lebbing <kjeld@schouten-lebbing.nl>
Signed-off-by: Sebastian Gottschall <s.gottschall@dd-wrt.com>
Closes #10938 
Closes #10969
This commit is contained in:
Sebastian Gottschall
2020-09-30 22:22:34 +02:00
committed by GitHub
parent c0bd2e0fe2
commit 8a171ccd92
3 changed files with 27 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/zstd/zfs_zstd.c
+16 -2
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@@ -238,7 +238,7 @@ zstd_mempool_alloc(struct zstd_pool *zstd_mempool, size_t size)
* Check if objects fits the size, if so we take it and
* update the timestamp.
*/
if (!mem && pool->mem && size <= pool->size) {
if (size && !mem && pool->mem && size <= pool->size) {
pool->timeout = gethrestime_sec() +
ZSTD_POOL_TIMEOUT;
mem = pool->mem;
@@ -257,7 +257,7 @@ zstd_mempool_alloc(struct zstd_pool *zstd_mempool, size_t size)
}
}
if (mem) {
if (!size || mem) {
return (mem);
}
@@ -688,6 +688,19 @@ zstd_mempool_deinit(void)
zstd_mempool_cctx = NULL;
}
/* release unused memory from pool */
void
zfs_zstd_cache_reap_now(void)
{
/*
* calling alloc with zero size seeks
* and releases old unused objects
*/
zstd_mempool_alloc(zstd_mempool_cctx, 0);
zstd_mempool_alloc(zstd_mempool_dctx, 0);
}
extern int __init
zstd_init(void)
{
@@ -735,4 +748,5 @@ ZFS_MODULE_VERSION(ZSTD_VERSION_STRING);
EXPORT_SYMBOL(zfs_zstd_compress);
EXPORT_SYMBOL(zfs_zstd_decompress_level);
EXPORT_SYMBOL(zfs_zstd_decompress);
EXPORT_SYMBOL(zfs_zstd_cache_reap_now);
#endif