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66e43912d6
In that level no io_priority_class-es exist. Instead, all the IO happens in the context of current sched-group. File API no longer accepts prio class argument (and makes io_intent arg mandatory to impls). So the change consists of - removing all usage of io_priority_class - patching file_impl's inheritants to updated API - priority manager goes away altogether - IO bandwidth update is performed on respective sched group - tune-up scylla-gdb.py io_queues command The first change is huge and was made semi-autimatically by: - grep io_priority_class | default_priority_class - remove all calls, found methods' args and class' fields Patching file_impl-s is smaller, but also mechanical: - replace io_priority_class& argument with io_intent* one - pass intent to lower file (if applicatble) Dropping the priority manager is: - git-rm .cc and .hh - sed out all the #include-s - fix configure.py and cmakefile The scylla-gdb.py update is a bit hairry -- it needs to use task queues list for IO classes names and shares, but to detect it should it checks for the "commitlog" group is present. Signed-off-by: Pavel Emelyanov <xemul@scylladb.com> Closes #13963
78 lines
2.7 KiB
C++
78 lines
2.7 KiB
C++
/*
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* Copyright (C) 2022-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#pragma once
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#include "dht/i_partitioner.hh"
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#include "readers/flat_mutation_reader_fwd.hh"
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#include "schema/schema_fwd.hh"
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#include "seastarx.hh"
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class reader_permit;
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class mutation_source;
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namespace tracing {
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class trace_state_ptr;
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}
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/// Make an auto-paused evictable reader.
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///
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/// The reader is paused after each use, that is after each call to any of its
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/// members that cause actual reading to be done (`fill_buffer()` and
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/// `fast_forward_to()`). When paused, the reader is made evictable, that it is
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/// it is registered with reader concurrency semaphore as an inactive read.
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/// The reader is resumed automatically on the next use. If it was evicted, it
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/// will be recreated at the position it left off reading. This is all
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/// transparent to its user.
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/// Parameters passed by reference have to be kept alive while the reader is
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/// alive.
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flat_mutation_reader_v2 make_auto_paused_evictable_reader_v2(
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mutation_source ms,
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schema_ptr schema,
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reader_permit permit,
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const dht::partition_range& pr,
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const query::partition_slice& ps,
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tracing::trace_state_ptr trace_state,
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mutation_reader::forwarding fwd_mr);
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class evictable_reader_v2;
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class evictable_reader_handle_v2 {
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friend std::pair<flat_mutation_reader_v2, evictable_reader_handle_v2> make_manually_paused_evictable_reader_v2(mutation_source, schema_ptr, reader_permit,
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const dht::partition_range&, const query::partition_slice&, tracing::trace_state_ptr, mutation_reader::forwarding);
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private:
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evictable_reader_v2* _r;
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private:
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explicit evictable_reader_handle_v2(evictable_reader_v2& r);
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public:
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void pause();
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};
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/// Make a manually-paused evictable reader.
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///
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/// The reader can be paused via the evictable reader handle when desired. The
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/// intended usage is subsequent reads done in bursts, after which the reader is
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/// not used for some time. When paused, the reader is made evictable, that is,
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/// it is registered with reader concurrency semaphore as an inactive read.
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/// The reader is resumed automatically on the next use. If it was evicted, it
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/// will be recreated at the position it left off reading. This is all
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/// transparent to its user.
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/// Parameters passed by reference have to be kept alive while the reader is
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/// alive.
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std::pair<flat_mutation_reader_v2, evictable_reader_handle_v2> make_manually_paused_evictable_reader_v2(
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mutation_source ms,
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schema_ptr schema,
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reader_permit permit,
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const dht::partition_range& pr,
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const query::partition_slice& ps,
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tracing::trace_state_ptr trace_state,
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mutation_reader::forwarding fwd_mr);
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