mirror of https://lore.kernel.org/lkml/
 help / color / mirror / Atom feed
From: Francesco Nigro <nigro.fra@gmail.com>
To: peterz@infradead.org, mingo@redhat.com, acme@kernel.org,
	namhyung@kernel.org
Cc: mark.rutland@arm.com, alexander.shishkin@linux.intel.com,
	jolsa@kernel.org, irogers@google.com, adrian.hunter@intel.com,
	james.clark@linaro.org, kan.liang@linux.intel.com,
	leo.yan@arm.com, linux-perf-users@vger.kernel.org,
	linux-kernel@vger.kernel.org, regressions@lists.linux.dev,
	Francesco Nigro <nigro.fra@gmail.com>
Subject: Re: [PATCH] perf test: Add test for events re-armed with PERF_EVENT_IOC_REFRESH
Date: Wed, 21 Oct 2026 16:16:30 +0200	[thread overview]
Message-ID: <20261021141630.2408518-1-nigro.fra@gmail.com> (raw)
In-Reply-To: <sashiko-outbox-180295@kernel.org>

> On systems with Transparent Huge Pages (THP) or multi-size THP (mTHP) set
> to "always" [...] As a result, overflows only reaches 489 (or fewer)
> instead of NR_EVENTS (1000), and count_overflows() returns TEST_FAIL.

Confirmed: on master with transparent_hugepage=always the software case
gets 489 of 1000 overflows. With madvise(MADV_NOHUGEPAGE) on the buffer it
gets all 1000, and the tracepoint case still gets 1. I'll send a v2 with
that change.

Thanks,
Francesco

       reply	other threads:[~2026-10-21 14:16 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <sashiko-outbox-180295@kernel.org>
2026-10-21 14:16 ` Francesco Nigro [this message]
2026-10-21 13:10 Francesco Nigro

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20261021141630.2408518-1-nigro.fra@gmail.com \
    --to=nigro.fra@gmail.com \
    --cc=acme@kernel.org \
    --cc=adrian.hunter@intel.com \
    --cc=alexander.shishkin@linux.intel.com \
    --cc=irogers@google.com \
    --cc=james.clark@linaro.org \
    --cc=jolsa@kernel.org \
    --cc=kan.liang@linux.intel.com \
    --cc=leo.yan@arm.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-perf-users@vger.kernel.org \
    --cc=mark.rutland@arm.com \
    --cc=mingo@redhat.com \
    --cc=namhyung@kernel.org \
    --cc=peterz@infradead.org \
    --cc=regressions@lists.linux.dev \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®