61 lines
2.9 KiB
Diff
61 lines
2.9 KiB
Diff
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From 3c494ecb0ed4c49b5843d458c0b487aee5d25963 Mon Sep 17 00:00:00 2001
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From: Karel Zak <kzak@redhat.com>
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Date: Wed, 9 Aug 2023 13:39:32 +0200
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Subject: zramctl: add hint about supported algorithms
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It seems the current list of the algorithms is confusing for
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end-users, because it's inaccurate in many cases. Let's explain why
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the list cannot be "perfect".
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Upstream: http://github.com/util-linux/util-linux/commit/2d7549b79f2b32f33cec3a5b518cddfe9a63506b
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Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=2203324
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Signed-off-by: Karel Zak <kzak@redhat.com>
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---
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sys-utils/zramctl.8.adoc | 4 +++-
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sys-utils/zramctl.c | 6 +++++-
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2 files changed, 8 insertions(+), 2 deletions(-)
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diff --git a/sys-utils/zramctl.8.adoc b/sys-utils/zramctl.8.adoc
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index 7b684ed44..ff83b6ec9 100644
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--- a/sys-utils/zramctl.8.adoc
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+++ b/sys-utils/zramctl.8.adoc
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@@ -38,8 +38,10 @@ Note that _zramdev_ node specified on command line has to already exist. The com
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== OPTIONS
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-*-a*, **--algorithm lzo**|**lz4**|**lz4hc**|**deflate**|*842*::
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+*-a*, **--algorithm lzo**|**lz4**|**lz4hc**|**deflate**|**842**|**zstd**::
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Set the compression algorithm to be used for compressing data in the zram device.
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++
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+The *list of supported algorithms could be inaccurate* as it depends on the current kernel configuration. A basic overview can be obtained by using the command "cat /sys/block/zram0/comp_algorithm"; however, please note that this list might also be incomplete. This is due to the fact that ZRAM utilizes the Crypto API, and if certain algorithms were built as modules, it becomes impossible to enumerate all of them.
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*-f*, *--find*::
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Find the first unused zram device. If a *--size* argument is present, then initialize the device.
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diff --git a/sys-utils/zramctl.c b/sys-utils/zramctl.c
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index 64d5fcd81..a84ce665b 100644
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--- a/sys-utils/zramctl.c
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+++ b/sys-utils/zramctl.c
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@@ -547,7 +547,7 @@ static void __attribute__((__noreturn__)) usage(void)
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fputs(_("Set up and control zram devices.\n"), out);
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fputs(USAGE_OPTIONS, out);
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- fputs(_(" -a, --algorithm lzo|lz4|lz4hc|deflate|842 compression algorithm to use\n"), out);
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+ fputs(_(" -a, --algorithm <alg> compression algorithm to use\n"), out);
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fputs(_(" -b, --bytes print sizes in bytes rather than in human readable format\n"), out);
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fputs(_(" -f, --find find a free device\n"), out);
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fputs(_(" -n, --noheadings don't print headings\n"), out);
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@@ -564,6 +564,10 @@ static void __attribute__((__noreturn__)) usage(void)
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fputs(USAGE_ARGUMENTS, out);
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printf(USAGE_ARG_SIZE(_("<size>")));
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+ fputs(_(" <alg> specify algorithm, supported are:\n"), out);
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+ fputs(_(" lzo, lz4, lz4hc, deflate, 842 and zstd\n"), out);
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+ fputs(_(" (List may be inaccurate, consult man page.)\n"), out);
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+
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fputs(USAGE_COLUMNS, out);
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for (i = 0; i < ARRAY_SIZE(infos); i++)
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fprintf(out, " %11s %s\n", infos[i].name, _(infos[i].help));
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--
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2.40.1
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