From: Ravi Bangoria <ravi.bangoria@amd.com>
To: Huang Shijie <huangsj@hygon.cn>
Cc: <peterz@infradead.org>, <mingo@redhat.com>, <acme@kernel.org>,
<namhyung@kernel.org>, <zhongyuan@hygon.cn>,
<fangbaoshun@hygon.cn>, <yingzhiwei@hygon.cn>,
<mark.rutland@arm.com>, <alexander.shishkin@linux.intel.com>,
<jolsa@kernel.org>, <irogers@google.com>,
<adrian.hunter@intel.com>, <james.clark@linaro.org>,
<tglx@kernel.org>, <bp@alien8.de>, <dave.hansen@linux.intel.com>,
<x86@kernel.org>, <hpa@zytor.com>,
<linux-perf-users@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <liuqi@hygon.cn>,
<lijing@hygon.cn>, <wangfengyu@hygon.cn>, <wujiangyong@hygon.cn>,
<shijie8@gmail.com>, "Ravi Bangoria" <ravi.bangoria@amd.com>
Subject: Re: [PATCH] perf/amd/ibs: add phy_addr_only software filter for ibs_op
Date: Tue, 27 Oct 2026 14:44:53 +0530 [thread overview]
Message-ID: <5af2d381-408f-442e-bba3-5bfeca01161f@amd.com> (raw)
In-Reply-To: <20260902085251.4046240-1-huangsj@hygon.cn>
> We use the following command to track a process's memory footprint:
> #perf record -e ibs_fetch// -e ibs_op// -p xxx --phys-addr -- sleep 10
>
> In the mysql tests, I catched over 1,804,973 records for ibs_op event.
> I found that over 53% records(970,554) are like this:
> ibs_op//: ffffffffb6017739 0
>
> The physical address is 0 for these records. These records are not needed
> by us, and they wasted the CPU cycles.
>
> This patch adds an ibs_op/phy_addr_only term that discards samples
> without a valid physical address (dc_phy_addr_valid == 0) in the interrupt
> handler. And it avoids the phys_addr=0 noise when used with --phys-data.
Why not simply use the BPF filter?
$ perf record -e ibs_op// --phys-data --filter 'phys_addr != 0' ...
Thanks,
Ravi
prev parent reply other threads:[~2026-10-27 9:17 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-02 8:52 Huang Shijie
2026-10-27 9:14 ` Ravi Bangoria [this message]
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