linux-kernel - [PATCH 2/5] vdso: Add comment about reason for vdso struct ordering

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Date: Mon, 01 Jul 2024 16:47:55 +0200
From: Anna-Maria Behnsen <anna-maria@...utronix.de>
To: Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, 
 Vincenzo Frascino <vincenzo.frascino@....com>
Cc: linux-kernel@...r.kernel.org, 
 Anna-Maria Behnsen <anna-maria@...utronix.de>
Subject: [PATCH 2/5] vdso: Add comment about reason for vdso struct
 ordering

Signed-off-by: Anna-Maria Behnsen <anna-maria@...utronix.de>
---
 include/vdso/datapage.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/vdso/datapage.h b/include/vdso/datapage.h
index d04d394db064..7647e0946f50 100644
--- a/include/vdso/datapage.h
+++ b/include/vdso/datapage.h
@@ -77,6 +77,10 @@ struct vdso_timestamp {
  * vdso_data will be accessed by 64 bit and compat code at the same time
  * so we should be careful before modifying this structure.
  *
+ * The ordering of the struct members is optimized to have fast access to the
+ * often required struct members which are related to CLOCK_REALTIME and
+ * CLOCK_MONOTONIC. This information is stored in the first cache lines.
+ *
  * @basetime is used to store the base time for the system wide time getter
  * VVAR page.
  *

-- 
2.39.2