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ARC: mm: retire ARC_DBG_TLB_MISS_COUNT...
... given that we have perf counters abel to do the same thing non intrusively Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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Vineet Gupta
parent
c300547588
commit
f644e36888
@ -540,14 +540,6 @@ config ARC_DBG_TLB_PARANOIA
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bool "Paranoia Checks in Low Level TLB Handlers"
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default n
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config ARC_DBG_TLB_MISS_COUNT
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bool "Profile TLB Misses"
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default n
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select DEBUG_FS
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help
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Counts number of I and D TLB Misses and exports them via Debugfs
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The counters can be cleared via Debugfs as well
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endif
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config ARC_UBOOT_SUPPORT
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@ -237,113 +237,3 @@ void show_kernel_fault_diag(const char *str, struct pt_regs *regs,
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if (!user_mode(regs))
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show_stacktrace(current, regs);
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}
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#ifdef CONFIG_DEBUG_FS
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/mount.h>
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#include <linux/pagemap.h>
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#include <linux/init.h>
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#include <linux/namei.h>
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#include <linux/debugfs.h>
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static struct dentry *test_dentry;
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static struct dentry *test_dir;
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static struct dentry *test_u32_dentry;
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static u32 clr_on_read = 1;
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#ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT
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u32 numitlb, numdtlb, num_pte_not_present;
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static int fill_display_data(char *kbuf)
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{
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size_t num = 0;
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num += sprintf(kbuf + num, "I-TLB Miss %x\n", numitlb);
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num += sprintf(kbuf + num, "D-TLB Miss %x\n", numdtlb);
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num += sprintf(kbuf + num, "PTE not present %x\n", num_pte_not_present);
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if (clr_on_read)
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numitlb = numdtlb = num_pte_not_present = 0;
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return num;
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}
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static int tlb_stats_open(struct inode *inode, struct file *file)
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{
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file->private_data = (void *)__get_free_page(GFP_KERNEL);
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return 0;
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}
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/* called on user read(): display the counters */
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static ssize_t tlb_stats_output(struct file *file, /* file descriptor */
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char __user *user_buf, /* user buffer */
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size_t len, /* length of buffer */
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loff_t *offset) /* offset in the file */
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{
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size_t num;
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char *kbuf = (char *)file->private_data;
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/* All of the data can he shoved in one iteration */
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if (*offset != 0)
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return 0;
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num = fill_display_data(kbuf);
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/* simple_read_from_buffer() is helper for copy to user space
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It copies up to @2 (num) bytes from kernel buffer @4 (kbuf) at offset
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@3 (offset) into the user space address starting at @1 (user_buf).
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@5 (len) is max size of user buffer
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*/
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return simple_read_from_buffer(user_buf, num, offset, kbuf, len);
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}
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/* called on user write : clears the counters */
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static ssize_t tlb_stats_clear(struct file *file, const char __user *user_buf,
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size_t length, loff_t *offset)
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{
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numitlb = numdtlb = num_pte_not_present = 0;
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return length;
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}
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static int tlb_stats_close(struct inode *inode, struct file *file)
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{
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free_page((unsigned long)(file->private_data));
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return 0;
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}
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static const struct file_operations tlb_stats_file_ops = {
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.read = tlb_stats_output,
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.write = tlb_stats_clear,
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.open = tlb_stats_open,
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.release = tlb_stats_close
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};
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#endif
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static int __init arc_debugfs_init(void)
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{
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test_dir = debugfs_create_dir("arc", NULL);
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#ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT
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test_dentry = debugfs_create_file("tlb_stats", 0444, test_dir, NULL,
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&tlb_stats_file_ops);
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#endif
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test_u32_dentry =
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debugfs_create_u32("clr_on_read", 0444, test_dir, &clr_on_read);
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return 0;
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}
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module_init(arc_debugfs_init);
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static void __exit arc_debugfs_exit(void)
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{
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debugfs_remove(test_u32_dentry);
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debugfs_remove(test_dentry);
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debugfs_remove(test_dir);
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}
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module_exit(arc_debugfs_exit);
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#endif
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@ -237,15 +237,6 @@ ex_saved_reg1:
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2:
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#ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT
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and.f 0, r0, _PAGE_PRESENT
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bz 1f
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ld r3, [num_pte_not_present]
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add r3, r3, 1
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st r3, [num_pte_not_present]
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1:
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#endif
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.endm
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;-----------------------------------------------------------------
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@ -309,12 +300,6 @@ ENTRY(EV_TLBMissI)
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TLBMISS_FREEUP_REGS
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#ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT
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ld r0, [@numitlb]
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add r0, r0, 1
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st r0, [@numitlb]
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#endif
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;----------------------------------------------------------------
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; Get the PTE corresponding to V-addr accessed, r2 is setup with EFA
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LOAD_FAULT_PTE
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@ -349,12 +334,6 @@ ENTRY(EV_TLBMissD)
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TLBMISS_FREEUP_REGS
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#ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT
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ld r0, [@numdtlb]
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add r0, r0, 1
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st r0, [@numdtlb]
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#endif
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;----------------------------------------------------------------
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; Get the PTE corresponding to V-addr accessed
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; If PTE exists, it will setup, r0 = PTE, r1 = Ptr to PTE, r2 = EFA
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