*/
kmem_cache_t *zio_cache;
kmem_cache_t *zio_link_cache;
+kmem_cache_t *zio_vdev_cache;
kmem_cache_t *zio_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT];
kmem_cache_t *zio_data_buf_cache[SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT];
int zio_bulk_flags = 0;
zio_cons, zio_dest, NULL, NULL, NULL, KMC_KMEM);
zio_link_cache = kmem_cache_create("zio_link_cache",
sizeof (zio_link_t), 0, NULL, NULL, NULL, NULL, NULL, KMC_KMEM);
+ zio_vdev_cache = kmem_cache_create("zio_vdev_cache", sizeof(vdev_io_t),
+ PAGESIZE, NULL, NULL, NULL, NULL, NULL, KMC_VMEM);
/*
* For small buffers, we want a cache for each multiple of
zio_data_buf_cache[c] = NULL;
}
+ kmem_cache_destroy(zio_vdev_cache);
kmem_cache_destroy(zio_link_cache);
kmem_cache_destroy(zio_cache);
ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT);
- return (kmem_cache_alloc(zio_buf_cache[c], KM_PUSHPAGE));
+ return (kmem_cache_alloc(zio_buf_cache[c], KM_PUSHPAGE | KM_NODEBUG));
}
/*
ASSERT(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT);
- return (kmem_cache_alloc(zio_data_buf_cache[c], KM_PUSHPAGE));
+ return (kmem_cache_alloc(zio_data_buf_cache[c],
+ KM_PUSHPAGE | KM_NODEBUG));
}
void
}
/*
+ * Dedicated I/O buffers to ensure that memory fragmentation never prevents
+ * or significantly delays the issuing of a zio. These buffers are used
+ * to aggregate I/O and could be used for raidz stripes.
+ */
+void *
+zio_vdev_alloc(void)
+{
+ return (kmem_cache_alloc(zio_vdev_cache, KM_PUSHPAGE));
+}
+
+void
+zio_vdev_free(void *buf)
+{
+ kmem_cache_free(zio_vdev_cache, buf);
+
+}
+
+/*
* ==========================================================================
* Push and pop I/O transform buffers
* ==========================================================================