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backport: clh: disable virtiofs DAX when FS cache size is 0 #3072

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devimc opened this issue Nov 12, 2020 · 0 comments · Fixed by #3073
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backport: clh: disable virtiofs DAX when FS cache size is 0 #3072

devimc opened this issue Nov 12, 2020 · 0 comments · Fixed by #3073
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enhancement Improvement to an existing feature needs-review Needs to be assessed by the team.

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devimc commented Nov 12, 2020

backport kata-containers/kata-containers#1101
@devimc devimc added enhancement Improvement to an existing feature needs-review Needs to be assessed by the team. labels Nov 12, 2020
@devimc devimc self-assigned this Nov 12, 2020
devimc pushed a commit to devimc/kata-runtime that referenced this issue Nov 12, 2020
runtime: clh: disable virtiofs DAX when FS cache size is 0
a22c0a1 
Guest consumes 120Mb more of memory when DAX is enabled and the default
FS cache size (8G) is used. Disable dax when it is not required
reducing guest's memory footprint.

Without this patch:

```
7fdea4000000-7fdee4000000 rw-s 18850589 /memfd:ch_ram (deleted)
Size:            1048576 kB
KernelPageSize:        4 kB
MMUPageSize:           4 kB
Rss:              187876 kB
```

With this patch:

```
7fa970000000-7fa9b0000000 rw-s 612001  /memfd:ch_ram (deleted)
Size:            1048576 kB
KernelPageSize:        4 kB
MMUPageSize:           4 kB
Rss:               57308 kB
Pss:               56722 kB
```

fixes kata-containers#3072

Signed-off-by: Julio Montes <[email protected]>
@devimc devimc mentioned this issue Nov 12, 2020
Merged
devimc pushed a commit to devimc/kata-runtime that referenced this issue Nov 13, 2020
runtime: clh: disable virtiofs DAX when FS cache size is 0
02af5c9 
Guest consumes 120Mb more of memory when DAX is enabled and the default
FS cache size (8G) is used. Disable dax when it is not required
reducing guest's memory footprint.

Without this patch:

```
7fdea4000000-7fdee4000000 rw-s 18850589 /memfd:ch_ram (deleted)
Size:            1048576 kB
KernelPageSize:        4 kB
MMUPageSize:           4 kB
Rss:              187876 kB
```

With this patch:

```
7fa970000000-7fa9b0000000 rw-s 612001  /memfd:ch_ram (deleted)
Size:            1048576 kB
KernelPageSize:        4 kB
MMUPageSize:           4 kB
Rss:               57308 kB
Pss:               56722 kB
```

fixes kata-containers#3072

Signed-off-by: Julio Montes <[email protected]>
likebreath pushed a commit to likebreath/kata-runtime that referenced this issue Apr 1, 2021
@likebreath
runtime: clh: disable virtiofs DAX when FS cache size is 0
2545f74 
Guest consumes 120Mb more of memory when DAX is enabled and the default
FS cache size (8G) is used. Disable dax when it is not required
reducing guest's memory footprint.

Without this patch:

```
7fdea4000000-7fdee4000000 rw-s 18850589 /memfd:ch_ram (deleted)
Size:            1048576 kB
KernelPageSize:        4 kB
MMUPageSize:           4 kB
Rss:              187876 kB
```

With this patch:

```
7fa970000000-7fa9b0000000 rw-s 612001  /memfd:ch_ram (deleted)
Size:            1048576 kB
KernelPageSize:        4 kB
MMUPageSize:           4 kB
Rss:               57308 kB
Pss:               56722 kB
```

fixes kata-containers#3072

Signed-off-by: Julio Montes <[email protected]>
(cherry picked from commit 02af5c9)
Signed-off-by: Bo Chen <[email protected]>
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[backport] runtime: clh: disable virtiofs DAX when FS cache size is 0 devimc/kata-runtime
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