linux-kernel - Re: [PATCH V3] x86/mm: Tracking linear mapping split events

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Message-ID: <20210128001507.zs5uuhniuttrjqjt@devvm1945.atn0.facebook.com>
Date:   Wed, 27 Jan 2021 16:15:07 -0800
From:   Saravanan D <saravanand@...com>
To:     Dave Hansen <dave.hansen@...el.com>
CC:     <x86@...nel.org>, <dave.hansen@...ux.intel.com>, <luto@...nel.org>,
        <peterz@...radead.org>, <linux-kernel@...r.kernel.org>,
        <kernel-team@...com>
Subject: Re: [PATCH V3] x86/mm: Tracking linear mapping split events

Hi Dave,

> We don't use __x86_64__ in the kernel.  This should be CONFIG_X86.
Noted. I will correct this in V4

> or the level from the bottom where the split occurred:
> 
> 	direct_map_level2_splits
> 	direct_map_level3_splits
> 
> That has the bonus of being usable on other architectures.
Naming them after page table levels makes lot of sense. 2 new vmstat 
event counters that is relevant for all without the need for #ifdef 
page size craziness.

- Saravanan D