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Include the memory overhead cost of cryptsetup when estimating the memory requirement for LUKS-encrypted target

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Currently, "kdumpctl estimate" neglects the memory overhead cost of
cryptsetup itself. Unfortunately, there is no golden formula to
calculate the overhead cost [1]. So estimate the overhead cost as 50M
for aarch64 and 20M for other architectures based on the following
empirical data,

| Overhead (M) | OS                                        | arch    |
| ------------ | ----------------------------------------- | ------- |
| 14.1         | RHEL-9.2.0-20220829.d.1                   | ppc64le |
| 14           | Fedora-37-20220830.n.0 Everything ppc64le | ppc64le |
| 17           | Fedora 36                                 | ppc64le |
| 8.8          | Fedora 35                                 | s390x   |
| 10.1         | Fedora-Rawhide-20220829.n.0, fc38         | s390x   |
| 42           | Fedora-Rawhide-20220829.n.0, fc38         | arch64  |
| 40           | F35                                       | arch64  |
| 42           | F36                                       | arch64  |
| 42           | Fedora-Rawhide-20220901.n.0               | arch64  |
| 10           | F35                                       | x86_64  |
| 10           | Fedora-Rawhide-20220901.n.0               | x86_64  |
| 11           | Fedora-Rawhide-20220901.n.0               | x86_64  |

[1] https://lore.kernel.org/cryptsetup/20220616044339.376qlipk5h2omhx2@Rk/T/#u

Fixes: e9e6a2c ("kdumpctl: Add kdumpctl estimate")
Signed-off-by: Coiby Xu <coxu@redhat.com>
Reviewed-by: Philipp Rudo <prudo@redhat.com>
This commit is contained in:
Coiby Xu 2022-09-05 18:08:44 +08:00
parent 50a8461fc7
commit 6ce4b85bb3
1 changed files with 12 additions and 2 deletions
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14
kdumpctl
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@ -1193,7 +1193,7 @@ do_estimate()
local kdump_mods
local -A large_mods
local baseline
local kernel_size mod_size initrd_size baseline_size runtime_size reserved_size estimated_size recommended_size
local kernel_size mod_size initrd_size baseline_size runtime_size reserved_size estimated_size recommended_size _cryptsetup_overhead
local size_mb=$((1024 * 1024))
setup_initrd
@ -1247,7 +1247,17 @@ do_estimate()
break
done
done
[[ $crypt_size -ne 0 ]] && echo -e "Encrypted kdump target requires extra memory, assuming using the keyslot with maximum memory requirement\n"
if [[ $crypt_size -ne 0 ]]; then
if [[ $(uname -m) == aarch64 ]]; then
_cryptsetup_overhead=50
else
_cryptsetup_overhead=20
fi
crypt_size=$((crypt_size + _cryptsetup_overhead * size_mb))
echo -e "Encrypted kdump target requires extra memory, assuming using the keyslot with maximum memory requirement\n"
fi
estimated_size=$((kernel_size + mod_size + initrd_size + runtime_size + crypt_size))
if [[ $baseline_size -gt $estimated_size ]]; then