From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-dy1-f201.google.com (mail-dy1-f201.google.com [74.125.82.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9BB6C3A5E61 for ; Sat, 25 Apr 2026 22:51:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777157487; cv=none; b=Ag9KL1xgEikbn+IWk4NWZOVgrwTtVTffjb5kCd/eVgp3/j4V9iWW1ZIShQhoiY0LbxW7xh0LP7bAEL0Vgxta5lBkZDzBWkxV3MteB03XZ2Yurx6YdVpswZIhg80UQYIJPvCH2aWB9iIJ4cKX7UXQgH7T2i1D0vPP3C3/DaRS+CQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777157487; c=relaxed/simple; bh=IJUCBgPg9wYDYawtxHW5XNHuYjUrl13nxcH5QuDBI54=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=Xw2wjBLQg4vYp6+Jbw/FvTi82hH51+FaNoNZOzF6FEGV4/1XDj1sGXPpiUKlNEG26MIBHDYDNov3nFEOwr+A6JAHPgl2fPAnXD/x9GilOgE4YBWMgLziD4aNl6YTChgT4cwNhwjUyY0pt41l7QG4+N9MzfbCCbaQffxLnkf6jgE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=dT3kZ33J; arc=none smtp.client-ip=74.125.82.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="dT3kZ33J" Received: by mail-dy1-f201.google.com with SMTP id 5a478bee46e88-2dd6fb4c867so15665389eec.0 for ; Sat, 25 Apr 2026 15:51:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1777157484; x=1777762284; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=yfBwBqR2Z+Zk1dnV7MbJ1NLKT+aSgQqUxonuLHmwfTg=; b=dT3kZ33JdfTBZ7ANWiwDC78HI1btq5Z8e0PVtej/OQ/f1Iw6wUaqUYuadI/WKOmSDx /6CGkUg+Rytq7JPuIjhA1Y8ZOEJpNFkVJ3jNiWA5RsW6tA4B3KQRfmQlZiApfcLKdfK2 iE4QilDHGOFAdgU7HzvpgrZ582jc4irsVf1/do9aPPaYuAELhfenb7+jKFbkWpNkdn8q 6EUNKrkwKbMpL7xeOw1cPp8RwnzkHrRWyF/sEupF8oK8RPKN4c3u6Z/7I58HC04Jt695 hoGsYxG0cM8/7D6gIMAOFWMYjGKHunpBfLpeTuBU4iEDJhGjRnqJDUJ2Zi8qCeILusnb boUQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1777157484; x=1777762284; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=yfBwBqR2Z+Zk1dnV7MbJ1NLKT+aSgQqUxonuLHmwfTg=; b=kUTro2wWy3Wso+DIXZaTRmSJYSyld77DDXxcr6O61L6vEzUCxe27gNHFzpkdKtx0jw /uCydfiXYZY9wCw1Qdc7BxcuxZiDjobJkZoknvR+lw4hzg7x83c0S0MAzpHYmTaCHd+D zhb546O2pZELpqaIXkKh8iszcEAyQH9woXLu1yWxjrjIgFskrLSToJvWEHYmHwfLo9hh BiE66uZ9eMsRoTwoq7v+GI/3/KLCCFpQfujfOI7Uc4wfF912fsAmJyPd5X/MzGFv10HK ad81ihLcAsU9ogqPNsgyP0WgUYrdgRMe3/91k6IvXOZgVTJRZzzSSJXN/QMZFc8j3HpN kE6w== X-Forwarded-Encrypted: i=1; AFNElJ+6CJtISXsX1KUi8mKfP7W/FbHz+uLYkS46lLnOcPVqCxK0a1n+fPVrtdunuhXrAbRsmpc4mIKpHDBYE+x5GoKF@vger.kernel.org X-Gm-Message-State: AOJu0YwVw6jOwOC9qI1V0A3PzljNfiC/CEmPlyjYVDk307FV6Yk4vzGg vculizscRofxLCaMgtBA2n5haQJ4foEXFZJeRwWJ/D9y4Y5ngqPRkhk3vQUfsxJUPW26dvFGQj+ N7Kx34JYHpg== X-Received: from dybuz22.prod.google.com ([2002:a05:7301:5096:b0:2df:70c6:196b]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7300:ca4:b0:2d9:6373:ad10 with SMTP id 5a478bee46e88-2e473cb4f9bmr17775893eec.7.1777157483617; Sat, 25 Apr 2026 15:51:23 -0700 (PDT) Date: Sat, 25 Apr 2026 15:49:26 -0700 In-Reply-To: <20260425224951.174663-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260425174858.3922152-1-irogers@google.com> <20260425224951.174663-1-irogers@google.com> X-Mailer: git-send-email 2.54.0.545.g6539524ca2-goog Message-ID: <20260425224951.174663-35-irogers@google.com> Subject: [PATCH v7 34/59] perf compaction-times: Port compaction-times to use python module From: Ian Rogers To: acme@kernel.org, adrian.hunter@intel.com, james.clark@linaro.org, leo.yan@linux.dev, namhyung@kernel.org, tmricht@linux.ibm.com Cc: alice.mei.rogers@gmail.com, dapeng1.mi@linux.intel.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, Ian Rogers Content-Type: text/plain; charset="UTF-8" Add a port of the compaction-times script that uses the perf python module directly. This approach is significantly faster than using perf script callbacks as it avoids creating intermediate dictionaries for all event fields. Assisted-by: Gemini:gemini-3.1-pro-preview Signed-off-by: Ian Rogers --- v2: Fixed Closure Call: Changed cls.fobj.filter(pid, comm) to cls.fobj(pid, comm) . Since fobj is a function (closure) and not a class instance, calling .filter() on it would raise an AttributeError . --- tools/perf/python/compaction-times.py | 326 ++++++++++++++++++++++++++ 1 file changed, 326 insertions(+) create mode 100755 tools/perf/python/compaction-times.py diff --git a/tools/perf/python/compaction-times.py b/tools/perf/python/compaction-times.py new file mode 100755 index 000000000000..7f17c251ded7 --- /dev/null +++ b/tools/perf/python/compaction-times.py @@ -0,0 +1,326 @@ +#!/usr/bin/env python3 +# SPDX-License-Identifier: GPL-2.0 +""" +Report time spent in memory compaction. + +Memory compaction is a feature in the Linux kernel that defragments memory +by moving used pages to create larger contiguous blocks of free memory. This +is particularly useful for allocating huge pages. + +This script processes trace events related to memory compaction and reports: +- Total time spent in compaction (stall time). +- Statistics for page migration (moved vs. failed). +- Statistics for the free scanner (scanned vs. isolated pages). +- Statistics for the migration scanner (scanned vs. isolated pages). + +Definitions: +- **Compaction**: Defragmenting memory by moving allocated pages. +- **Migration**: Moving pages from their current location to free pages found by the free scanner. +- **Free Scanner**: Scans memory (typically from the end of a zone) to find free pages. +- **Migration Scanner**: Scans memory (typically from the beginning of a zone) + to find pages to move. +- **Isolated Pages**: Pages that have been temporarily removed from the buddy + system for migration or as migration targets. + +Ported from tools/perf/scripts/python/compaction-times.py to the modern perf Python module. +""" + +import argparse +import enum +import re +import sys +from typing import Callable, Dict, List, Optional, Any +import perf + +class Popt(enum.IntEnum): + """Process display options.""" + DISP_DFL = 0 + DISP_PROC = 1 + DISP_PROC_VERBOSE = 2 + +class Topt(enum.IntFlag): + """Trace display options.""" + DISP_TIME = 0 + DISP_MIG = 1 + DISP_ISOLFREE = 2 + DISP_ISOLMIG = 4 + DISP_ALL = DISP_MIG | DISP_ISOLFREE | DISP_ISOLMIG + +# Globals to satisfy pylint when accessed in functions before assignment in main. +OPT_NS = True +opt_disp = Topt.DISP_ALL +opt_proc = Popt.DISP_DFL +session = None + +def get_comm_filter(regex: re.Pattern) -> Callable[[int, str], bool]: + """Returns a filter function based on command regex.""" + def filter_func(_pid: int, comm: str) -> bool: + regex_match = regex.search(comm) + return regex_match is None or regex_match.group() == "" + return filter_func + +def get_pid_filter(low_str: str, high_str: str) -> Callable[[int, str], bool]: + """Returns a filter function based on PID range.""" + low = 0 if low_str == "" else int(low_str) + high = 0 if high_str == "" else int(high_str) + + def filter_func(pid: int, _comm: str) -> bool: + return not (pid >= low and (high == 0 or pid <= high)) + return filter_func + +def ns_to_time(ns: int) -> str: + """Format nanoseconds to string based on options.""" + return f"{ns}ns" if OPT_NS else f"{round(ns, -3) // 1000}us" + +class Pair: + """Represents a pair of related counters (e.g., scanned vs isolated, moved vs failed).""" + def __init__(self, aval: int, bval: int, + alabel: Optional[str] = None, blabel: Optional[str] = None): + self.alabel = alabel + self.blabel = blabel + self.aval = aval + self.bval = bval + + def __add__(self, rhs: 'Pair') -> 'Pair': + self.aval += rhs.aval + self.bval += rhs.bval + return self + + def __str__(self) -> str: + return f"{self.alabel}={self.aval} {self.blabel}={self.bval}" + +class Cnode: + """Holds statistics for a single compaction event or an aggregated set of events.""" + def __init__(self, ns: int): + self.ns = ns + self.migrated = Pair(0, 0, "moved", "failed") + self.fscan = Pair(0, 0, "scanned", "isolated") + self.mscan = Pair(0, 0, "scanned", "isolated") + + def __add__(self, rhs: 'Cnode') -> 'Cnode': + self.ns += rhs.ns + self.migrated += rhs.migrated + self.fscan += rhs.fscan + self.mscan += rhs.mscan + return self + + def __str__(self) -> str: + prev = False + s = f"{ns_to_time(self.ns)} " + if opt_disp & Topt.DISP_MIG: + s += f"migration: {self.migrated}" + prev = True + if opt_disp & Topt.DISP_ISOLFREE: + s += f"{' ' if prev else ''}free_scanner: {self.fscan}" + prev = True + if opt_disp & Topt.DISP_ISOLMIG: + s += f"{' ' if prev else ''}migration_scanner: {self.mscan}" + return s + + def complete(self, secs: int, nsecs: int) -> None: + """Complete the node with duration.""" + self.ns = (secs * 1000000000 + nsecs) - self.ns + + def increment(self, migrated: Optional[Pair], fscan: Optional[Pair], + mscan: Optional[Pair]) -> None: + """Increment statistics.""" + if migrated is not None: + self.migrated += migrated + if fscan is not None: + self.fscan += fscan + if mscan is not None: + self.mscan += mscan + +class Chead: + """Aggregates compaction statistics per process (PID) and maintains total statistics.""" + heads: Dict[int, 'Chead'] = {} + val = Cnode(0) + fobj: Optional[Any] = None + + @classmethod + def add_filter(cls, fobj: Any) -> None: + """Add a filter object.""" + cls.fobj = fobj + + @classmethod + def create_pending(cls, pid: int, comm: str, start_secs: int, start_nsecs: int) -> None: + """Create a pending node for a process.""" + filtered = False + try: + head = cls.heads[pid] + filtered = head.is_filtered() + except KeyError: + if cls.fobj is not None: + filtered = cls.fobj(pid, comm) + head = cls.heads[pid] = Chead(comm, pid, filtered) + + if not filtered: + head.mark_pending(start_secs, start_nsecs) + + @classmethod + def increment_pending(cls, pid: int, migrated: Optional[Pair], + fscan: Optional[Pair], mscan: Optional[Pair]) -> None: + """Increment pending stats for a process.""" + if pid not in cls.heads: + return + head = cls.heads[pid] + if not head.is_filtered(): + if head.is_pending(): + head.do_increment(migrated, fscan, mscan) + else: + sys.stderr.write(f"missing start compaction event for pid {pid}\n") + + @classmethod + def complete_pending(cls, pid: int, secs: int, nsecs: int) -> None: + """Complete pending stats for a process.""" + if pid not in cls.heads: + return + head = cls.heads[pid] + if not head.is_filtered(): + if head.is_pending(): + head.make_complete(secs, nsecs) + else: + sys.stderr.write(f"missing start compaction event for pid {pid}\n") + + @classmethod + def gen(cls): + """Generate heads for display.""" + if opt_proc != Popt.DISP_DFL: + yield from cls.heads.values() + + @classmethod + def get_total(cls) -> Cnode: + """Get total statistics.""" + return cls.val + + def __init__(self, comm: str, pid: int, filtered: bool): + self.comm = comm + self.pid = pid + self.val = Cnode(0) + self.pending: Optional[Cnode] = None + self.filtered = filtered + self.list: List[Cnode] = [] + + def mark_pending(self, secs: int, nsecs: int) -> None: + """Mark node as pending.""" + self.pending = Cnode(secs * 1000000000 + nsecs) + + def do_increment(self, migrated: Optional[Pair], fscan: Optional[Pair], + mscan: Optional[Pair]) -> None: + """Increment pending stats.""" + if self.pending is not None: + self.pending.increment(migrated, fscan, mscan) + + def make_complete(self, secs: int, nsecs: int) -> None: + """Make pending stats complete.""" + if self.pending is not None: + self.pending.complete(secs, nsecs) + Chead.val += self.pending + + if opt_proc != Popt.DISP_DFL: + self.val += self.pending + + if opt_proc == Popt.DISP_PROC_VERBOSE: + self.list.append(self.pending) + self.pending = None + + def enumerate(self) -> None: + """Enumerate verbose stats.""" + if opt_proc == Popt.DISP_PROC_VERBOSE and not self.is_filtered(): + for i, pelem in enumerate(self.list): + sys.stdout.write(f"{self.pid}[{self.comm}].{i+1}: {pelem}\n") + + def is_pending(self) -> bool: + """Check if node is pending.""" + return self.pending is not None + + def is_filtered(self) -> bool: + """Check if node is filtered.""" + return self.filtered + + def display(self) -> None: + """Display stats.""" + if not self.is_filtered(): + sys.stdout.write(f"{self.pid}[{self.comm}]: {self.val}\n") + +def trace_end() -> None: + """Called at the end of trace processing.""" + sys.stdout.write(f"total: {Chead.get_total()}\n") + for i in Chead.gen(): + i.display() + i.enumerate() + +def process_event(sample: perf.sample_event) -> None: + """Callback for processing events.""" + event_name = str(sample.evsel) + pid = sample.sample_pid + comm = session.find_thread(pid).comm() if session else "[unknown]" + secs = sample.sample_time // 1000000000 + nsecs = sample.sample_time % 1000000000 + + if "evsel(compaction:mm_compaction_begin)" in event_name: + Chead.create_pending(pid, comm, secs, nsecs) + elif "evsel(compaction:mm_compaction_end)" in event_name: + Chead.complete_pending(pid, secs, nsecs) + elif "evsel(compaction:mm_compaction_migratepages)" in event_name: + Chead.increment_pending(pid, Pair(sample.nr_migrated, sample.nr_failed), None, None) + elif "evsel(compaction:mm_compaction_isolate_freepages)" in event_name: + Chead.increment_pending(pid, None, Pair(sample.nr_scanned, sample.nr_taken), None) + elif "evsel(compaction:mm_compaction_isolate_migratepages)" in event_name: + Chead.increment_pending(pid, None, None, Pair(sample.nr_scanned, sample.nr_taken)) + +if __name__ == "__main__": + ap = argparse.ArgumentParser(description="Report time spent in compaction") + ap.add_argument("-p", action="store_true", help="display by process") + ap.add_argument("-pv", action="store_true", help="display by process (verbose)") + ap.add_argument("-u", action="store_true", help="display results in microseconds") + ap.add_argument("-t", action="store_true", help="display stall times only") + ap.add_argument("-m", action="store_true", help="display stats for migration") + ap.add_argument("-fs", action="store_true", help="display stats for free scanner") + ap.add_argument("-ms", action="store_true", help="display stats for migration scanner") + ap.add_argument("filter", nargs="?", help="pid|pid-range|comm-regex") + ap.add_argument("-i", "--input", default="perf.data", help="Input file name") + args = ap.parse_args() + + opt_proc = Popt.DISP_DFL + if args.pv: + opt_proc = Popt.DISP_PROC_VERBOSE + elif args.p: + opt_proc = Popt.DISP_PROC + + OPT_NS = not args.u + + opt_disp = Topt.DISP_ALL + if args.t or args.m or args.fs or args.ms: + opt_disp = Topt(0) + if args.t: + opt_disp |= Topt.DISP_TIME + if args.m: + opt_disp |= Topt.DISP_MIG + if args.fs: + opt_disp |= Topt.DISP_ISOLFREE + if args.ms: + opt_disp |= Topt.DISP_ISOLMIG + + if args.filter: + PID_PATTERN = r"^(\d*)-(\d*)$|^(\d*)$" + pid_re = re.compile(PID_PATTERN) + match = pid_re.search(args.filter) + filter_obj: Any = None + if match is not None and match.group() != "": + if match.group(3) is not None: + filter_obj = get_pid_filter(match.group(3), match.group(3)) + else: + filter_obj = get_pid_filter(match.group(1), match.group(2)) + else: + try: + comm_re = re.compile(args.filter) + except re.error: + sys.stderr.write(f"invalid regex '{args.filter}'\n") + sys.exit(1) + filter_obj = get_comm_filter(comm_re) + Chead.add_filter(filter_obj) + + session = perf.session(perf.data(args.input), sample=process_event) + session.process_events() + trace_end() -- 2.54.0.545.g6539524ca2-goog