linux-kernel - Re: [PATCH] xfs: add tunable threshold parameter for triggering zone GC

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Message-Id: <174479312058.188145.11238177508667153075.b4-ty@kernel.org>
Date: Wed, 16 Apr 2025 10:45:20 +0200
From: Carlos Maiolino <cem@...nel.org>
To: Dave Chinner <david@...morbit.com>, 
 "Darrick J . Wong" <djwong@...nel.org>, 
 Hans Holmberg <Hans.Holmberg@....com>
Cc: hch <hch@....de>, linux-xfs@...r.kernel.org, 
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xfs: add tunable threshold parameter for triggering
 zone GC

On Tue, 25 Mar 2025 09:10:49 +0000, Hans Holmberg wrote:
> Presently we start garbage collection late - when we start running
> out of free zones to backfill max_open_zones. This is a reasonable
> default as it minimizes write amplification. The longer we wait,
> the more blocks are invalidated and reclaim cost less in terms
> of blocks to relocate.
> 
> Starting this late however introduces a risk of GC being outcompeted
> by user writes. If GC can't keep up, user writes will be forced to
> wait for free zones with high tail latencies as a result.
> 
> [...]

Applied to for-next, thanks!

[1/1] xfs: add tunable threshold parameter for triggering zone GC
      commit: 845abeb1f06a8a44e21314460eeb14cddfca52cc

Best regards,
-- 
Carlos Maiolino <cem@...nel.org>