/proc/meminfo says VmallocUsed is 0. So where are my kernel modules stored?
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I thought the code for kernel modules was stored in a vmalloc() allocation? (In fact I'm sure the kernel code is using vmalloc(), not kvmalloc()). So why does /proc/meminfo say I have no zero VmallocUsed ?
$ grep Vmalloc /proc/meminfo
VmallocTotal: 34359738367 kB
VmallocUsed: 0 kB
VmallocChunk: 0 kB
$ lsmod|head
Module Size Used by
vfio_mdev 16384 0
mdev 20480 1 vfio_mdev
vfio_iommu_type1 28672 0
vfio 32768 2 vfio_mdev,vfio_iommu_type1
kvm_intel 237568 0
kvm 737280 1 kvm_intel
irqbypass 16384 1 kvm
dummy 16384 0
binfmt_misc 20480 1
linux-kernel memory kernel-modules
asked Nov 19 at 14:40
sourcejedi
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I thought the code for kernel modules was stored in a vmalloc() allocation? (In fact I'm sure the kernel code is using vmalloc(), not kvmalloc()). So why does /proc/meminfo say I have no zero VmallocUsed ?
$ grep Vmalloc /proc/meminfo
VmallocTotal: 34359738367 kB
VmallocUsed: 0 kB
VmallocChunk: 0 kB
$ lsmod|head
Module Size Used by
vfio_mdev 16384 0
mdev 20480 1 vfio_mdev
vfio_iommu_type1 28672 0
vfio 32768 2 vfio_mdev,vfio_iommu_type1
kvm_intel 237568 0
kvm 737280 1 kvm_intel
irqbypass 16384 1 kvm
dummy 16384 0
binfmt_misc 20480 1
linux-kernel memory kernel-modules
asked Nov 19 at 14:40
sourcejedi
21.9k43396
add a comment |
up vote
1
down vote
favorite
up vote
1
down vote
favorite
I thought the code for kernel modules was stored in a vmalloc() allocation? (In fact I'm sure the kernel code is using vmalloc(), not kvmalloc()). So why does /proc/meminfo say I have no zero VmallocUsed ?
$ grep Vmalloc /proc/meminfo
VmallocTotal: 34359738367 kB
VmallocUsed: 0 kB
VmallocChunk: 0 kB
$ lsmod|head
Module Size Used by
vfio_mdev 16384 0
mdev 20480 1 vfio_mdev
vfio_iommu_type1 28672 0
vfio 32768 2 vfio_mdev,vfio_iommu_type1
kvm_intel 237568 0
kvm 737280 1 kvm_intel
irqbypass 16384 1 kvm
dummy 16384 0
binfmt_misc 20480 1
linux-kernel memory kernel-modules
asked Nov 19 at 14:40
sourcejedi
21.9k43396
I thought the code for kernel modules was stored in a vmalloc() allocation? (In fact I'm sure the kernel code is using vmalloc(), not kvmalloc()). So why does /proc/meminfo say I have no zero VmallocUsed ?
$ grep Vmalloc /proc/meminfo
VmallocTotal: 34359738367 kB
VmallocUsed: 0 kB
VmallocChunk: 0 kB
$ lsmod|head
Module Size Used by
vfio_mdev 16384 0
mdev 20480 1 vfio_mdev
vfio_iommu_type1 28672 0
vfio 32768 2 vfio_mdev,vfio_iommu_type1
kvm_intel 237568 0
kvm 737280 1 kvm_intel
irqbypass 16384 1 kvm
dummy 16384 0
binfmt_misc 20480 1
linux-kernel memory kernel-modules
linux-kernel memory kernel-modules
asked Nov 19 at 14:40
sourcejedi
21.9k43396
asked Nov 19 at 14:40
sourcejedi
21.9k43396
asked Nov 19 at 14:40
sourcejedi
21.9k43396
asked Nov 19 at 14:40
sourcejedi
21.9k43396
asked Nov 19 at 14:40
sourcejedi
21.9k43396
21.9k43396
add a comment |
add a comment |
1 Answer
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The fields were zeroed in Linux 4.4, for performance reasons. Programs linked against glibc read this file when they started up, and it was causing a measurable impact.
https://github.com/torvalds/linux/commit/a5ad88ce8c7fae7ddc72ee49a11a75aa837788e0
answered Nov 19 at 14:40
sourcejedi
21.9k43396
add a comment |
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
2
down vote
accepted
The fields were zeroed in Linux 4.4, for performance reasons. Programs linked against glibc read this file when they started up, and it was causing a measurable impact.
https://github.com/torvalds/linux/commit/a5ad88ce8c7fae7ddc72ee49a11a75aa837788e0
answered Nov 19 at 14:40
sourcejedi
21.9k43396
add a comment |
up vote
2
down vote
accepted
The fields were zeroed in Linux 4.4, for performance reasons. Programs linked against glibc read this file when they started up, and it was causing a measurable impact.
https://github.com/torvalds/linux/commit/a5ad88ce8c7fae7ddc72ee49a11a75aa837788e0
answered Nov 19 at 14:40
sourcejedi
21.9k43396
add a comment |
up vote
2
down vote
accepted
up vote
2
down vote
accepted
The fields were zeroed in Linux 4.4, for performance reasons. Programs linked against glibc read this file when they started up, and it was causing a measurable impact.
https://github.com/torvalds/linux/commit/a5ad88ce8c7fae7ddc72ee49a11a75aa837788e0
answered Nov 19 at 14:40
sourcejedi
21.9k43396
The fields were zeroed in Linux 4.4, for performance reasons. Programs linked against glibc read this file when they started up, and it was causing a measurable impact.
https://github.com/torvalds/linux/commit/a5ad88ce8c7fae7ddc72ee49a11a75aa837788e0
answered Nov 19 at 14:40
sourcejedi
21.9k43396
answered Nov 19 at 14:40
sourcejedi
21.9k43396
answered Nov 19 at 14:40
sourcejedi
21.9k43396
answered Nov 19 at 14:40
sourcejedi
21.9k43396
21.9k43396
add a comment |
add a comment |
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