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0f69dae4d1
High order memory stuff within trace could introduce OOM, use kvzalloc instead. Please find the bellowing for the call stack we run across in an android system. The scenario happens when traced_probes is woken up to get a large quantity of trace even if free memory is even higher than watermark_low. traced_probes invoked oom-killer: gfp_mask=0x140c0c0(GFP_KERNEL|__GFP_COMP|__GFP_ZERO), nodemask=(null), order=2, oom_score_adj=-1 traced_probes cpuset=system-background mems_allowed=0 CPU: 3 PID: 588 Comm: traced_probes Tainted: G W O 4.14.181 #1 Hardware name: Generic DT based system (unwind_backtrace) from [<c010d824>] (show_stack+0x20/0x24) (show_stack) from [<c0b2e174>] (dump_stack+0xa8/0xec) (dump_stack) from [<c027d584>] (dump_header+0x9c/0x220) (dump_header) from [<c027cfe4>] (oom_kill_process+0xc0/0x5c4) (oom_kill_process) from [<c027cb94>] (out_of_memory+0x220/0x310) (out_of_memory) from [<c02816bc>] (__alloc_pages_nodemask+0xff8/0x13a4) (__alloc_pages_nodemask) from [<c02a6a1c>] (kmalloc_order+0x30/0x48) (kmalloc_order) from [<c02a6a64>] (kmalloc_order_trace+0x30/0x118) (kmalloc_order_trace) from [<c0223d7c>] (tracing_buffers_open+0x50/0xfc) (tracing_buffers_open) from [<c02e6f58>] (do_dentry_open+0x278/0x34c) (do_dentry_open) from [<c02e70d0>] (vfs_open+0x50/0x70) (vfs_open) from [<c02f7c24>] (path_openat+0x5fc/0x169c) (path_openat) from [<c02f75c4>] (do_filp_open+0x94/0xf8) (do_filp_open) from [<c02e7650>] (do_sys_open+0x168/0x26c) (do_sys_open) from [<c02e77bc>] (SyS_openat+0x34/0x38) (SyS_openat) from [<c0108bc0>] (ret_fast_syscall+0x0/0x28) Link: https://lkml.kernel.org/r/1596155265-32365-1-git-send-email-zhaoyang.huang@unisoc.com Signed-off-by: Zhaoyang Huang <zhaoyang.huang@unisoc.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.