btrfs: use kvzalloc to allocate btrfs_fs_info

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The srcu_struct in btrfs_fs_info scales in size with NR_CPUS.  On
kernels built with NR_CPUS=8192, this can result in kmalloc failures
that prevent mounting.

There is work in progress to try to resolve this for every user of
srcu_struct but using kvzalloc will work around the failures until
that is complete.

As an example with NR_CPUS=512 on x86_64: the overall size of
subvol_srcu is 3460 bytes, fs_info is 6496.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Jeff Mahoney 2018-02-15 22:59:47 -05:00 • committed by David Sterba

parent fd649f10c3

commit a8fd1f7174

2 changed files with 2 additions and 2 deletions

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2

fs/btrfs/ctree.h

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2

fs/btrfs/super.c

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