linux-kernel - Re: [RFC PATCH 5/6] zsmalloc: introduce handle mapping API

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Message-ID: <xlclsibpdk4d5unc34movxduvmhibsufctscudrdzxsovncwe6@3lrijye7zvlc>
Date: Tue, 28 Jan 2025 10:13:00 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Yosry Ahmed <yosry.ahmed@...ux.dev>
Cc: Sergey Senozhatsky <senozhatsky@...omium.org>, 
	Andrew Morton <akpm@...ux-foundation.org>, Minchan Kim <minchan@...nel.org>, 
	Johannes Weiner <hannes@...xchg.org>, Nhat Pham <nphamcs@...il.com>, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 5/6] zsmalloc: introduce handle mapping API

On (25/01/28 00:49), Yosry Ahmed wrote:
> > Preemption is disabled via zspage-s rwlock_t - zs_map_object() returns
> > with it being locked and it's being unlocked in zs_unmap_object().  Then
> > the function disables pagefaults and per-CPU local lock (protects per-CPU
> > vm-area) additionally disables preemption.
> 
> Right, I meant it does not always disable page faults.

I'll add "sometimes" :)

[..]
> Anyway, if this function will be removed soon then it's not worth
> revisiting it now.

Ack.