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| author | Will Deacon <will.deacon@arm.com> | 2013-05-13 14:21:49 (GMT) |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2013-08-20 10:54:53 (GMT) |
| commit | 28256d612726a28a8b9d3c49f2b74198c4423d6a (patch) | |
| tree | a64cd498ec1e9f4d34f77bcc827a541f19099bce /arch/arm/include | |
| parent | 377747c40657eb35ad98a56439606d96a928425a (diff) | |
| download | linux-28256d612726a28a8b9d3c49f2b74198c4423d6a.tar.xz | |
ARM: cacheflush: split user cache-flushing into interruptible chunks
Flushing a large, non-faulting VMA from userspace can potentially result
in a long time spent flushing the cache line-by-line without preemption
occurring (in the case of CONFIG_PREEMPT=n).
Whilst this doesn't affect the stability of the system, it can certainly
affect the responsiveness and CPU availability for other tasks.
This patch splits up the user cacheflush code so that it flushes in
chunks of a page. After each chunk has been flushed, we may reschedule
if appropriate and, before processing the next chunk, we allow any
pending signals to be handled before resuming from where we left off.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm/include')
| -rw-r--r-- | arch/arm/include/asm/thread_info.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/arm/include/asm/thread_info.h b/arch/arm/include/asm/thread_info.h index 214d415..7d77645 100644 --- a/arch/arm/include/asm/thread_info.h +++ b/arch/arm/include/asm/thread_info.h @@ -43,6 +43,16 @@ struct cpu_context_save { __u32 extra[2]; /* Xscale 'acc' register, etc */ }; +struct arm_restart_block { + union { + /* For user cache flushing */ + struct { + unsigned long start; + unsigned long end; + } cache; + }; +}; + /* * low level task data that entry.S needs immediate access to. * __switch_to() assumes cpu_context follows immediately after cpu_domain. @@ -68,6 +78,7 @@ struct thread_info { unsigned long thumbee_state; /* ThumbEE Handler Base register */ #endif struct restart_block restart_block; + struct arm_restart_block arm_restart_block; }; #define INIT_THREAD_INFO(tsk) \ |