[gamin] Re: gam_server eats CPU

[Daniel Veillard <veillard redhat com>]

On Fri, Mar 04, 2005 at 04:24:45PM -0800, Pete Zaitcev wrote:
> On Fri, 4 Mar 2005 16:35:47 -0500 Daniel Veillard <veillard redhat com> wrote:
> > On Fri, Mar 04, 2005 at 01:16:23PM -0800, Pete Zaitcev wrote:
> 
> > > I have a situation where an application makes small writes to a file.
> > > In such a case, gam_server hogs the CPU. Here's a screen capture from
> > > top(1):
> > [...]
> > > I run Fedora Core 3 with Nautilus enabled, and so I cannot just remove
> > > Gamin and be happy. Does anyone have any ideas what do about this?
> > 
> >   Are you running gamin-0.0.25 ? 
> 
> I wasn't, but I have found out that it's the same with gamin-0.0.25.
> Also, I looked at the strace dump. It's quite strange. At first,
> gam_server does its poll cycles. Everything seems ok... Then:
> 
> .................
> poll([{fd=13, events=0}, {fd=14, events=POLLIN}, {fd=15, events=POLLIN}, {fd=16, events=POLLIN}, {fd=17, events=POLLIN}, {fd=13, events=POLLIN}, {fd=3, events=POLLIN}], 7, 972) = 0
> gettimeofday({1109981438, 502778}, NULL) = 0
> time(NULL)                              = 1109981438
> stat64("/q/zaitcev", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
> stat64("/q/zaitcev", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
> open("/q/zaitcev", O_RDONLY)            = 23
> fcntl64(23, F_SETSIG, 0x22)             = 0
> fcntl64(23, 0x402 /* F_??? */, 0x8000003e) = 0
> --- SIGRT_2 (Real-time signal 0) @ 0 (0) ---
> write(12, "bogus", 5)                   = 5
> rt_sigreturn(0x17)                      = 0
> --- SIGRT_2 (Real-time signal 0) @ 0 (0) ---
> write(12, "bogus", 5)                   = 5
> rt_sigreturn(0x17)                      = 0
> --- SIGRT_2 (Real-time signal 0) @ 0 (0) ---
> write(12, "bogus", 5)                   = 5
> rt_sigreturn(0x17)                      = 0
> ........
> 
> These signal things go on and on without end. Descriptor 12 is a pipe,
> not a socket.
> 
> The whole thing runs under stock 2.6.11 with CONFIG_DNOTIFY=y.
> As far as I can tell, inotify is not included into the kernel.

  Okay, then please open a bugzilla entry specifying a way to reproduce this,
I will look at it closely then.

  thanks,

Daniel

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