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    Subject[PATCH v5 00/50] Improvements to memory use
    From
    Fix memory leaks detected by address/leak sanitizer affecting LBR
    call-graphs, perf mem and BPF offcpu.

    Make branch_type_stat in callchain_list optional as it is large and
    not always necessary - in particular it isn't used by perf top.

    Make the allocations of zstd streams, kernel symbols and event copies
    lazier in order to save memory in cases like perf record.

    Handle the thread exit event and have it remove the thread from the
    threads set in machine. Don't do this for perf report as it causes a
    regression for task lists, which assume threads are never removed from
    the machine's set, and offcpu events, that may sythensize samples for
    threads that have exited.

    Avoid using 8kb buffers for filename__read_str which is excessive for
    reading CPU maps. Add io_dir as an allocation free readdir
    replacement, opendir allocating 32kb by default and the code uses it
    recursively.

    Shrink perf map using a two value byte to replace two function
    pointers. Modify the implementation of maps to not use an rbtree as
    the container for maps, instead use a sorted array. Improve locking
    and reference counting issues.

    Similar to maps separate out and reimplement threads to use a hashmap
    for lower memory consumption and faster look up. The fixes a
    regression in memory usage where reference count checking switched to
    using non-invasive tree nodes. Reduce its default size by 32 times
    and improve locking discipline. Also, fix regressions where tids had
    become unordered to make `perf report --tasks` and
    `perf trace --summary` output easier to read.

    Better encapsulate the dsos abstraction. Remove the linked list and
    rbtree used for faster iteration and log(n) lookup to a sorted array
    for similar performance but half the memory usage per dso. Improve
    reference counting and locking discipline, adding reference count
    checking to dso. Experimented with, but abandoned, a hashmap
    implementation due to the need for extra storage and the keys not
    being stable.

    The overall effect is to reduce memory consumption significantly for
    perf top - with call graphs enabled running longer before 1GB of
    memory is consumed. For a perf record of 'true', the memory
    consumption goes from 39912kb max resident to 20096kb max resident -
    nearly halved. perf inject with -b of a system wide perf record of
    'true' reduces the max resident by roughly 4.5% (3.4% in v4 due to
    branch_type_stat changes being merged). This is while improving
    correctness with locking discipline and reference count checking.

    Patch organization (v5):
    - 50 patches is a lot, the patches aren't divided as they merge conflict and
    later patches, for example in dsos, rely on the changes and fixes to maps.
    - the dso reference count checking patch is larger due to switch use of dso to
    be by accessors, to encapsulate the reference count checker macros. The
    reference count checking changes within this largely mechanical change amount
    to a few lines and so weren't separated.
    - the first patch contains a build fix if the rwsem error checking is
    enabled missed from v3.
    - the next patches are an assortment of memory size fixes.
    - the next patches are the refactoring of maps.
    - the next patches are the refactoring of threads.
    - the next patches are the refactoring of dsos.
    - finally reference count checking is added to dso and some lock/reference
    count issues are resolved. This is done after changing the data structures,
    for example, as the single pointer on an array is easier to add reference
    count checking to compared to the 5 previous pointers.

    v5: 3 patches were merged. 2nd patch addressed feedback from
    namhyung@kernel.org and Guilherme Amadio <amadio@gentoo.org>. 4th
    patch rename function to getdelim as suggested by
    namhyung@kernel.org. 5 patch adds the missing sysfs mountpoint as
    suggested by namhyung@kernel.org. 49th patch fix a missed put in
    the dso_data tests.
    v4: Rebased as 11 changes moved to perf-tools-next. Address comments
    from v3 such as error checking on zstd streams. Improve the
    dsos/dso in ways similar to threads and maps, with the addition of
    reference count checking on dso.
    v3: Additional memory/speed improvements, in particular for maps and
    threads. Address review comments from namhyung@kernel.org and
    adrian.hunter@intel.com.
    v2: Add additional memory fixes on top of initial LBR and rc check
    fixes.

    Ian Rogers (50):
    perf comm: Use regular mutex
    libperf: Lazily allocate/size mmap event copy
    perf mmap: Lazily initialize zstd streams
    tools api fs: Switch filename__read_str to use io.h
    tools api fs: Avoid reading whole file for a 1 byte bool
    tools lib api: Add io_dir an allocation free readdir alternative
    perf maps: Switch modules tree walk to io_dir__readdir
    perf record: Be lazier in allocating lost samples buffer
    perf pmu: Switch to io_dir__readdir
    perf header: Switch mem topology to io_dir__readdir
    perf events: Remove scandir in thread synthesis
    perf map: Simplify map_ip/unmap_ip and make map size smaller
    perf maps: Move symbol maps functions to maps.c
    perf thread: Add missing RC_CHK_EQUAL
    perf maps: Add maps__for_each_map to call a function on each entry
    perf maps: Add remove maps function to remove a map based on callback
    perf debug: Expose debug file
    perf maps: Refactor maps__fixup_overlappings
    perf maps: Do simple merge if given map doesn't overlap
    perf maps: Rename clone to copy from
    perf maps: Add maps__load_first
    perf maps: Add find next entry to give entry after the given map
    perf maps: Reduce scope of map_rb_node and maps internals
    perf maps: Fix up overlaps during fixup_end
    perf maps: Switch from rbtree to lazily sorted array for addresses
    perf maps: Get map before returning in maps__find
    perf maps: Get map before returning in maps__find_by_name
    perf maps: Get map before returning in maps__find_next_entry
    perf maps: Hide maps internals
    perf maps: Locking tidy up of nr_maps
    perf dso: Reorder variables to save space in struct dso
    perf report: Sort child tasks by tid
    perf trace: Ignore thread hashing in summary
    perf machine: Move fprintf to for_each loop and a callback
    perf threads: Move threads to its own files
    perf threads: Switch from rbtree to hashmap
    perf threads: Reduce table size from 256 to 8
    perf dsos: Attempt to better abstract dsos internals
    perf dsos: Tidy reference counting and locking
    perf dsos: Add dsos__for_each_dso
    perf dso: Move dso functions out of dsos
    perf dsos: Switch more loops to dsos__for_each_dso
    perf dsos: Switch backing storage to array from rbtree/list
    perf dsos: Remove __dsos__addnew
    perf dsos: Remove __dsos__findnew_link_by_longname_id
    perf dsos: Switch hand code to bsearch
    perf dso: Add reference count checking and accessor functions
    perf dso: Reference counting related fixes
    perf dso: Use container_of to avoid a pointer in dso_data
    perf env: Avoid recursively taking env->bpf_progs.lock

    tools/lib/api/Makefile | 2 +-
    tools/lib/api/fs/fs.c | 80 +-
    tools/lib/api/io.h | 11 +-
    tools/lib/api/io_dir.h | 75 +
    tools/lib/perf/include/internal/mmap.h | 3 +-
    tools/lib/perf/mmap.c | 21 +-
    tools/perf/arch/x86/tests/dwarf-unwind.c | 1 +
    tools/perf/arch/x86/util/event.c | 103 +-
    tools/perf/builtin-annotate.c | 6 +-
    tools/perf/builtin-buildid-cache.c | 2 +-
    tools/perf/builtin-buildid-list.c | 18 +-
    tools/perf/builtin-inject.c | 96 +-
    tools/perf/builtin-kallsyms.c | 2 +-
    tools/perf/builtin-mem.c | 4 +-
    tools/perf/builtin-record.c | 57 +-
    tools/perf/builtin-report.c | 243 ++--
    tools/perf/builtin-script.c | 8 +-
    tools/perf/builtin-top.c | 4 +-
    tools/perf/builtin-trace.c | 41 +-
    tools/perf/tests/code-reading.c | 8 +-
    tools/perf/tests/dso-data.c | 67 +-
    tools/perf/tests/hists_common.c | 6 +-
    tools/perf/tests/hists_cumulate.c | 4 +-
    tools/perf/tests/hists_output.c | 2 +-
    tools/perf/tests/maps.c | 64 +-
    tools/perf/tests/symbols.c | 2 +-
    tools/perf/tests/thread-maps-share.c | 8 +-
    tools/perf/tests/vmlinux-kallsyms.c | 181 +--
    tools/perf/ui/browsers/annotate.c | 6 +-
    tools/perf/ui/browsers/hists.c | 8 +-
    tools/perf/ui/browsers/map.c | 4 +-
    tools/perf/util/Build | 1 +
    tools/perf/util/annotate.c | 44 +-
    tools/perf/util/auxtrace.c | 2 +-
    tools/perf/util/block-info.c | 2 +-
    tools/perf/util/bpf-event.c | 17 +-
    tools/perf/util/bpf-event.h | 12 +-
    tools/perf/util/bpf_lock_contention.c | 10 +-
    tools/perf/util/build-id.c | 136 +-
    tools/perf/util/build-id.h | 2 -
    tools/perf/util/callchain.c | 4 +-
    tools/perf/util/comm.c | 10 +-
    tools/perf/util/compress.h | 6 +-
    tools/perf/util/data-convert-json.c | 2 +-
    tools/perf/util/db-export.c | 6 +-
    tools/perf/util/debug.c | 22 +-
    tools/perf/util/debug.h | 1 +
    tools/perf/util/dlfilter.c | 12 +-
    tools/perf/util/dso.c | 468 ++++---
    tools/perf/util/dso.h | 544 ++++++--
    tools/perf/util/dsos.c | 529 ++++---
    tools/perf/util/dsos.h | 40 +-
    tools/perf/util/env.c | 53 +-
    tools/perf/util/env.h | 4 +
    tools/perf/util/event.c | 12 +-
    tools/perf/util/header.c | 47 +-
    tools/perf/util/hist.c | 4 +-
    tools/perf/util/intel-pt.c | 22 +-
    tools/perf/util/machine.c | 652 +++------
    tools/perf/util/machine.h | 32 +-
    tools/perf/util/map.c | 93 +-
    tools/perf/util/map.h | 83 +-
    tools/perf/util/maps.c | 1239 +++++++++++++----
    tools/perf/util/maps.h | 95 +-
    tools/perf/util/mmap.c | 5 +-
    tools/perf/util/mmap.h | 1 -
    tools/perf/util/pmu.c | 48 +-
    tools/perf/util/pmus.c | 30 +-
    tools/perf/util/probe-event.c | 62 +-
    tools/perf/util/rb_resort.h | 5 -
    .../scripting-engines/trace-event-python.c | 21 +-
    tools/perf/util/session.c | 21 +
    tools/perf/util/session.h | 2 +
    tools/perf/util/sort.c | 19 +-
    tools/perf/util/srcline.c | 65 +-
    tools/perf/util/symbol-elf.c | 138 +-
    tools/perf/util/symbol.c | 521 ++-----
    tools/perf/util/symbol.h | 1 -
    tools/perf/util/symbol_fprintf.c | 4 +-
    tools/perf/util/synthetic-events.c | 156 ++-
    tools/perf/util/thread.c | 48 +-
    tools/perf/util/thread.h | 6 -
    tools/perf/util/threads.c | 186 +++
    tools/perf/util/threads.h | 35 +
    tools/perf/util/unwind-libunwind-local.c | 50 +-
    tools/perf/util/unwind-libunwind.c | 9 +-
    tools/perf/util/vdso.c | 89 +-
    tools/perf/util/zstd.c | 63 +-
    88 files changed, 4101 insertions(+), 2827 deletions(-)
    create mode 100644 tools/lib/api/io_dir.h
    create mode 100644 tools/perf/util/threads.c
    create mode 100644 tools/perf/util/threads.h

    --
    2.43.0.rc1.413.gea7ed67945-goog

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