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From 74759e0e9736e86c7d2439bfe74ca5eb51b0a52b Mon Sep 17 00:00:00 2001
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From: Tao Liu <ltao@redhat.com>
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Date: Mon, 19 Sep 2022 17:49:23 +0800
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Subject: [PATCH 25/28] Let "kmem" print task context with physical address
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Patch [1] enables "kmem" to print task context if the given virtual
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address is a vmalloced stack.
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This patch lets "kmem" print task context also when the given address
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is a physical address.
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Before:
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crash> kmem 1883700e28
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VMAP_AREA VM_STRUCT ADDRESS RANGE SIZE
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ffff94eb9102c640 ffff94eb9102b140 ffffb7efce9b8000 - ffffb7efce9bd000 20480
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PAGE PHYSICAL MAPPING INDEX CNT FLAGS
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ffffdd28220dc000 1883700000 0 0 1 50000000000000
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After:
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crash> kmem 1883700e28
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PID: 847
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COMMAND: "khungtaskd"
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TASK: ffff94f8038f4000 [THREAD_INFO: ffff94f8038f4000]
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CPU: 72
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STATE: TASK_RUNNING (PANIC)
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VMAP_AREA VM_STRUCT ADDRESS RANGE SIZE
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ffff94eb9102c640 ffff94eb9102b140 ffffb7efce9b8000 - ffffb7efce9bd000 20480
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PAGE PHYSICAL MAPPING INDEX CNT FLAGS
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ffffdd28220dc000 1883700000 0 0 1 50000000000000
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[1]: https://listman.redhat.com/archives/crash-utility/2022-September/010115.html
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[ kh: squashed the 4/4 patch into 3/4 ]
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Signed-off-by: Tao Liu <ltao@redhat.com>
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Signed-off-by: Kazuhito Hagio <k-hagio-ab@nec.com>
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Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
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---
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memory.c | 8 ++++++--
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1 file changed, 6 insertions(+), 2 deletions(-)
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diff --git a/memory.c b/memory.c
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index a60c3f9493f6..ff6b571361eb 100644
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--- a/memory.c
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+++ b/memory.c
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@@ -13506,6 +13506,10 @@ kmem_search(struct meminfo *mi)
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mi->flags &= ~GET_PHYS_TO_VMALLOC;
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if (mi->retval) {
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+ if ((task = stkptr_to_task(mi->retval)) && (tc = task_to_context(task))) {
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+ show_context(tc);
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+ fprintf(fp, "\n");
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+ }
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if ((sp = value_search(mi->retval, &offset))) {
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show_symbol(sp, offset,
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SHOW_LINENUM | SHOW_RADIX());
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@@ -13562,11 +13566,11 @@ kmem_search(struct meminfo *mi)
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/*
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* Check whether it's a current task or stack address.
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*/
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- if ((mi->memtype == KVADDR) && (task = vaddr_in_task_struct(vaddr)) &&
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+ if ((mi->memtype & (KVADDR|PHYSADDR)) && (task = vaddr_in_task_struct(vaddr)) &&
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(tc = task_to_context(task))) {
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show_context(tc);
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fprintf(fp, "\n");
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- } else if ((mi->memtype == KVADDR) && (task = stkptr_to_task(vaddr)) &&
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+ } else if ((mi->memtype & (KVADDR|PHYSADDR)) && (task = stkptr_to_task(vaddr)) &&
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(tc = task_to_context(task))) {
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show_context(tc);
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fprintf(fp, "\n");
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--
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2.37.1
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