From: Steven Rostedt <rostedt@goodmis.org>
To: Paul Burton <paulburton@google.com>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
Joel Fernandes <joelaf@google.com>,
stable@vger.kernel.org
Subject: Re: [PATCH 2/2] tracing: Resize tgid_map to PID_MAX_LIMIT, not PID_MAX_DEFAULT
Date: Wed, 30 Jun 2021 08:35:13 -0400 [thread overview]
Message-ID: <20210630083513.1658a6fb@oasis.local.home> (raw)
In-Reply-To: <20210630003406.4013668-2-paulburton@google.com>
On Tue, 29 Jun 2021 17:34:06 -0700
Paul Burton <paulburton@google.com> wrote:
> On 64 bit systems this will increase the size of tgid_map from 256KiB to
> 16MiB. Whilst this 64x increase in memory overhead sounds significant 64
> bit systems are presumably best placed to accommodate it, and since
> tgid_map is only allocated when the record-tgid option is actually used
> presumably the user would rather it spends sufficient memory to actually
> record the tgids they expect.
NAK. Please see how I fixed this for the saved_cmdlines, and implement
it the same way.
785e3c0a3a87 ("tracing: Map all PIDs to command lines")
It's a cache, it doesn't need to save everything.
-- Steve
>
> The size of tgid_map will also increase for CONFIG_BASE_SMALL=y
> configurations, but these seem unlikely to be systems upon which people
> are running ftrace with record-tgid anyway.
next prev parent reply other threads:[~2021-06-30 12:35 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-30 0:34 [PATCH 1/2] tracing: Simplify & fix saved_tgids logic Paul Burton
2021-06-30 0:34 ` [PATCH 2/2] tracing: Resize tgid_map to PID_MAX_LIMIT, not PID_MAX_DEFAULT Paul Burton
2021-06-30 12:35 ` Steven Rostedt [this message]
2021-06-30 21:09 ` Paul Burton
2021-06-30 21:34 ` Steven Rostedt
2021-06-30 22:34 ` Joel Fernandes
2021-06-30 23:11 ` Steven Rostedt
2021-07-01 13:55 ` Steven Rostedt
2021-07-01 17:24 ` [PATCH v2 1/2] tracing: Simplify & fix saved_tgids logic Paul Burton
2021-07-01 17:24 ` [PATCH v2 2/2] tracing: Resize tgid_map to pid_max, not PID_MAX_DEFAULT Paul Burton
2021-07-01 18:12 ` Steven Rostedt
2021-07-01 18:15 ` Paul Burton
2021-07-01 18:27 ` Steven Rostedt
2021-07-01 18:07 ` [PATCH v2 1/2] tracing: Simplify & fix saved_tgids logic Joel Fernandes
2021-06-30 12:31 ` [PATCH " Steven Rostedt
2021-06-30 16:43 ` Joel Fernandes
2021-06-30 22:29 ` Joel Fernandes
2021-07-01 17:31 ` Paul Burton
2021-07-01 18:05 ` Joel Fernandes
2021-07-01 18:07 ` Steven Rostedt
2021-07-01 18:09 ` Joel Fernandes
2021-07-01 18:12 ` Paul Burton
2021-07-01 18:26 ` Steven Rostedt
2021-07-01 19:35 ` Joe Perches
2021-07-01 19:51 ` Steven Rostedt
2021-07-01 21:07 ` Joe Perches
2021-07-01 23:49 ` Joel Fernandes
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