Hello, I started to write the deduplication metrics code in order to be able to design asynchronous deduplication.
I am looking for a way to create a metric allowing deduplication to be paused or resumed on a given threshold. Does anyone have a sugestion regarding the metric that could be used for this ? Best regards Benoît > Le Wednesday 02 Jan 2013 à 17:16:03 (+0100), Benoît Canet a écrit : > This patchset is a cleanup of the previous QCOW2 deduplication rfc. > > One can compile and install https://github.com/wernerd/Skein3Fish and use the > --enable-skein-dedup configure option in order to use the faster skein HASH. > > Images must be created with "-o dedup=[skein|sha256]" in order to activate the > deduplication in the image. > > Deduplication is now fast enough to be usable. > > v4: Fix and complete qcow2 spec [Stefan] > Hash the hash_algo field in the header extension [Stefan] > Fix qcow2 spec [Eric] > Remove pointer to hash and simplify hash memory management [Stefan] > Rename and move qcow2_read_cluster_data to qcow2.c [Stefan] > Document lock dropping behaviour of the previous function [Stefan] > cleanup qcow2_dedup_read_missing_cluster_data [Stefan] > rename *_offset to *_sect [Stefan] > add a ./configure check for ssl [Stefan] > Replace openssl by gnutls [Stefan] > Implement Skein hashes > Rewrite pretty every qcow2-dedup.c commits after Add > qcow2_dedup_read_missing_and_concatenate to simplify the code > Use 64KB deduplication hash block to reduce allocation flushes > Use 64KB l2 tables to reduce allocation flushes [breaks compatibility] > Use lazy refcounts to avoid qcow2_cache_set_dependency loops resultings > in frequent caches flushes > Do not create and load dedup RAM structures when bdrs->read_only is true > > v3: make it work barely > replace kernel red black trees by gtree. > > *** BLURB HERE *** > > Benoît Canet (30): > qcow2: Add deduplication to the qcow2 specification. > qcow2: Add deduplication structures and fields. > qcow2: Add qcow2_dedup_read_missing_and_concatenate > qcow2: Make update_refcount public. > qcow2: Create a way to link to l2 tables when deduplicating. > qcow2: Add qcow2_dedup and related functions > qcow2: Add qcow2_dedup_store_new_hashes. > qcow2: Implement qcow2_compute_cluster_hash. > qcow2: Extract qcow2_dedup_grow_table > qcow2: Add qcow2_dedup_grow_table and use it. > qcow2: create function to load deduplication hashes at startup. > qcow2: Load and save deduplication table header extension. > qcow2: Extract qcow2_do_table_init. > qcow2-cache: Allow to choose table size at creation. > qcow2: Add qcow2_dedup_init and qcow2_dedup_close. > qcow2: Extract qcow2_add_feature and qcow2_remove_feature. > block: Add qemu-img dedup create option. > qcow2: Behave correctly when refcount reach 0 or 2^16. > qcow2: Integrate deduplication in qcow2_co_writev loop. > qcow2: Serialize write requests when deduplication is activated. > qcow2: Add verification of dedup table. > qcow2: Adapt checking of QCOW_OFLAG_COPIED for dedup. > qcow2: Add check_dedup_l2 in order to check l2 of dedup table. > qcow2: Do not overwrite existing entries with QCOW_OFLAG_COPIED. > qcow2: Integrate SKEIN hash algorithm in deduplication. > qcow2: Add lazy refcounts to deduplication to prevent > qcow2_cache_set_dependency loops > qcow2: Use large L2 table for deduplication. > qcow: Set dedup cluster block size to 64KB. > qcow2: init and cleanup deduplication. > qemu-iotests: Filter dedup=on/off so existing tests don't break. > > block/Makefile.objs | 1 + > block/qcow2-cache.c | 12 +- > block/qcow2-cluster.c | 116 +++-- > block/qcow2-dedup.c | 1157 > ++++++++++++++++++++++++++++++++++++++++++ > block/qcow2-refcount.c | 157 ++++-- > block/qcow2.c | 357 +++++++++++-- > block/qcow2.h | 120 ++++- > configure | 55 ++ > docs/specs/qcow2.txt | 100 +++- > include/block/block_int.h | 1 + > tests/qemu-iotests/common.rc | 3 +- > 11 files changed, 1955 insertions(+), 124 deletions(-) > create mode 100644 block/qcow2-dedup.c > > -- > 1.7.10.4 >
