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Freeing throttle should account for holes

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Deletion throttle currently does not account for holes in a file.
This means that it can activate when it shouldn't.
To fix it we switch the throttle to be based on the number of
L1 blocks we will have to dirty when freeing

Reviewed by: Tom Caputi <tcaputi@datto.com>
Reviewed by: Matt Ahrens <mahrens@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alek Pinchuk <apinchuk@datto.com>
Closes #7725 
Closes #7888
This commit is contained in:
Alek P
2019-02-12 12:01:08 -08:00
committed by Brian Behlendorf
parent dcec0a12c8
commit 65282ee9e0
2 changed files with 37 additions and 16 deletions
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man/man5/zfs-module-parameters.5
+6 -6
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@@ -1,7 +1,7 @@
'\" te
.\" Copyright (c) 2013 by Turbo Fredriksson <turbo@bayour.com>. All rights reserved.
.\" Copyright (c) 2017 Datto Inc.
.\" Copyright (c) 2018 by Delphix. All rights reserved.
.\" Copyright (c) 2019 Datto Inc.
.\" The contents of this file are subject to the terms of the Common Development
.\" and Distribution License (the "License"). You may not use this file except
.\" in compliance with the License. You can obtain a copy of the license at
@@ -14,7 +14,7 @@
.\" CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your
.\" own identifying information:
.\" Portions Copyright [yyyy] [name of copyright owner]
.TH ZFS-MODULE-PARAMETERS 5 "Oct 28, 2017"
.TH ZFS-MODULE-PARAMETERS 5 "Feb 8, 2019"
.SH NAME
zfs\-module\-parameters \- ZFS module parameters
.SH DESCRIPTION
@@ -1970,12 +1970,12 @@ Default value: \fB52,428,800\fR.
\fBzfs_per_txg_dirty_frees_percent \fR (ulong)
.ad
.RS 12n
Tunable to control percentage of dirtied blocks from frees in one TXG.
After this threshold is crossed, additional dirty blocks from frees
wait until the next TXG.
Tunable to control percentage of dirtied indirect blocks from frees allowed
into one TXG. After this threshold is crossed, additional frees will wait until
the next TXG.
A value of zero will disable this throttle.
.sp
Default value: \fB30\fR and \fB0\fR to disable.
Default value: \fB5\fR, set to \fB0\fR to disable.
.RE
.sp