From: Indu Bhagat <indu.bhagat@oracle.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: linux-toolchains@vger.kernel.org, daandemeyer@meta.com,
andrii@kernel.org, rostedt@goodmis.org, kris.van.hees@oracle.com,
elena.zannoni@oracle.com, nick.alcock@oracle.com
Subject: Re: [POC 3/5] sframe: add new SFrame library
Date: Tue, 2 May 2023 23:03:03 -0700 [thread overview]
Message-ID: <241444c6-2ec9-f3ae-d350-72346d7fee85@oracle.com> (raw)
In-Reply-To: <20230502093022.GL1597476@hirez.programming.kicks-ass.net>
On 5/2/23 02:30, Peter Zijlstra wrote:
> On Mon, May 01, 2023 at 01:04:08PM -0700, Indu Bhagat wrote:
>> + /*
>> + * Skip binary search if FDE sub-section is not sorted on PCs. GNU ld
>> + * sorts the FDEs on start PC by default though.
>> + */
>> + if ((header->preamble.flags & SFRAME_F_FDE_SORTED) == 0) {
>> + sframe_set_errno(errp, SFRAME_ERR_FDE_NOTSORTED);
>> + return NULL;
>> + }
>
> Why does SFrame allow unsorted at all? That seems like a bug in the
> spec.
The GNU assembler emits an SFrame section with Function Descriptor
Entries (FDEs) not sorted on PC.
Its only the GNU ld which always emits the final SFrame section with
FDEs sorted on the start PCs of functions.
next prev parent reply other threads:[~2023-05-03 6:03 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-01 20:04 [POC 0/5] SFrame based stack tracer for user space in the kernel Indu Bhagat
2023-05-01 20:04 ` [POC 1/5] Kconfig: x86: Add new config options for userspace unwinder Indu Bhagat
2023-05-01 20:04 ` [POC 2/5] task_struct : add additional member for sframe state Indu Bhagat
2023-05-01 20:04 ` [POC 3/5] sframe: add new SFrame library Indu Bhagat
2023-05-01 22:40 ` Steven Rostedt
2023-05-02 5:07 ` Indu Bhagat
2023-05-02 8:46 ` Peter Zijlstra
2023-05-02 9:09 ` Peter Zijlstra
2023-05-02 9:20 ` Peter Zijlstra
2023-05-02 9:28 ` Peter Zijlstra
2023-05-02 9:30 ` Peter Zijlstra
2023-05-03 6:03 ` Indu Bhagat [this message]
2023-05-02 10:31 ` Peter Zijlstra
2023-05-02 10:41 ` Peter Zijlstra
2023-05-02 15:22 ` Steven Rostedt
2023-05-01 20:04 ` [POC 4/5] sframe: add an SFrame format stack tracer Indu Bhagat
2023-05-01 23:00 ` Steven Rostedt
2023-05-02 6:16 ` Indu Bhagat
2023-05-02 8:53 ` Peter Zijlstra
2023-05-02 9:04 ` Peter Zijlstra
2023-05-01 20:04 ` [POC 5/5] x86_64: invoke SFrame based stack tracer for user space Indu Bhagat
2023-05-01 23:11 ` Steven Rostedt
2023-05-02 10:53 ` Peter Zijlstra
2023-05-02 15:27 ` Steven Rostedt
2023-05-16 17:25 ` Andrii Nakryiko
2023-05-16 17:38 ` Steven Rostedt
2023-05-16 17:51 ` Andrii Nakryiko
2024-03-13 14:37 ` Tatsuyuki Ishi
2024-03-13 14:52 ` Steven Rostedt
2024-03-13 14:58 ` Tatsuyuki Ishi
2024-03-13 15:04 ` Steven Rostedt
2023-05-01 22:15 ` [POC 0/5] SFrame based stack tracer for user space in the kernel Steven Rostedt
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