On function fsnotify issue.

Bellow is content of perf report:

..........................
       │ ↑ jmpq 1f6 ▒
       │40b: cmpq $0x0,0x220(%rdi) ▒
       │ mov (%rdx),%rax ▒
       │ lea -0x20(%rax),%rbx ▒
       │ ↑ jne 78 ▒
       │ test %rbx,%rbx ▒
       │ ↓ je 433 ▒
       │ cmpq $0x0,0xe0(%rax) ▒
100,00 │ ↑ jne 78 ▒
       │433: xor %eax,%eax ▒
       │ ↑ jmpq 30a ▒
       │43a: test %rbx,%rbx ▒
       │ ↑ je 361 ▒
       │ test %r15d,0x108(%rbx) ▒
       │ ↑ jne d8 ▒
       │ ↑ jmpq 361 ▒
       │455: testb $0x4,0xcce9b6(%rip) ▒
       │ ↑ je 185 ▒
       │ xor %r11d,%r11d ▒
       │ xor %esi,%esi
.................................

Here is function file http://lxr.free-electrons.com/source/fs/notify/fsnotify.c#L190

277
278 if (ret && (mask & ALL_FSNOTIFY_PERM_EVENTS))
279 goto out;
280

On loop these lines take to long time to bee processed.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-22-generic 4.4.0-22.40
ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/pcmC0D0p: asu 3213 F...m pulseaudio
 /dev/snd/controlC0: asu 3213 F.... pulseaudio
CurrentDesktop: MATE
Date: Sat Jun 11 17:26:52 2016
InstallationDate: Installed on 2016-04-29 (43 days ago)
InstallationMedia: Ubuntu-Studio 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
IwConfig:
 lo no wireless extensions.

 enp1s0 no wireless extensions.
MachineType: Olidata S.p.A. ALABAMA
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-22-generic root=/dev/mapper/192--168--0--108--vg-root ro
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-22-generic N/A
 linux-backports-modules-4.4.0-22-generic N/A
 linux-firmware 1.157
RfKill:

SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/08/2008
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: S0101
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: To be filled by O.E.M.
dmi.board.vendor: To be filled by O.E.M.
dmi.board.version: To be filled by O.E.M.
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrS0101:bd07/08/2008:svnOlidataS.p.A.:pnALABAMA:pvrToBeFilledByO.E.M.:rvnTobefilledbyO.E.M.:rnTobefilledbyO.E.M.:rvrTobefilledbyO.E.M.:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: ALABAMA
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: Olidata S.p.A.