mirror of https://github.com/mkerrisk/man-pages
perf_event_open.2: Minor tweaks
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk
parent
1e554f3e32
commit
5ae2634dba
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@ -880,11 +880,11 @@ instruction's retirement.
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.BR PERF_SAMPLE_PHYS_ADDR " (since Linux 4.13)"
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.\" commit fc7ce9c74c3ad232b084d80148654f926d01ece7
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Records physical address of data like in
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.B PERF_SAMPLE_ADDR .
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.BR PERF_SAMPLE_ADDR .
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.TP
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.BR PERF_SAMPLE_CGROUP " (since Linux 5.7)"
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.\" commit 96aaab686505c449e24d76e76507290dcc30e008
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Records (perf_event) cgroup id of the process.
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Records (perf_event) cgroup ID of the process.
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This corresponds to the
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.I id
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field in the
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@ -1227,28 +1227,28 @@ settings.
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.TP
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.IR write_backward " (since Linux 4.6)"
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.\" commit 9ecda41acb971ebd07c8fb35faf24005c0baea12
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This makes the ring buffer is written from end to beginning.
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This causes the ring buffer to be written from the end to the beginning.
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This is to support reading from overwritable ring buffer.
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.TP
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.IR namespaces " (since Linux 4.11)"
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.\" commit e422267322cd319e2695a535e47c5b1feeac45eb
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This enables the generation of
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.B PERF_RECORD_NAMESPACES
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records when a task is entering to a new namespace.
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records when a task enters a new namespace.
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Each namespace has a combination of device and inode numbers.
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.TP
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.IR ksymbol " (since Linux 5.0)"
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.\" commit 76193a94522f1d4edf2447a536f3f796ce56343b
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This enables the generation of
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.B PERF_RECORD_KSYMBOL
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records when a new kernel symbols are registered or unregistered.
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records when new kernel symbols are registered or unregistered.
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This is analyzing dynamic kernel functions like eBPF.
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.TP
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.IR bpf_event " (since Linux 5.0)"
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.\" commit 6ee52e2a3fe4ea35520720736e6791df1fb67106
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This enables the generation of
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.B PERF_RECORD_BPF_EVENT
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records when a eBPF program is loaded or unloaded.
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records when an eBPF program is loaded or unloaded.
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.TP
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.IR auxevent " (since Linux 5.4)"
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.\" commit ab43762ef010967e4ccd53627f70a2eecbeafefb
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@ -1266,7 +1266,7 @@ records when a new cgroup is created (and activated).
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This enables the generation of
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.B PERF_RECORD_TEXT_POKE
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records when there's a changes to the kernel text
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(i.e. self-modifying code).
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(i.e., self-modifying code).
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.TP
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.IR wakeup_events ", " wakeup_watermark
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This union sets how many samples
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@ -2642,13 +2642,14 @@ bit mask.
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.I phys_addr
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If the
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.B PERF_SAMPLE_PHYS_ADDR
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flag is set, then 64-bit physical address is recorded.
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flag is set, then the 64-bit physical address is recorded.
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.TP
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.I cgroup
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If the
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.B PERF_SAMPLE_CGROUP
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flag is set, then 64-bit cgroup id (for the perf_event subsystem) is recorded.
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To get the pathname of the cgroup, the id should match to one in a
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flag is set,
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then the 64-bit cgroup ID (for the perf_event subsystem) is recorded.
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To get the pathname of the cgroup, the ID should match to one in a
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.B PERF_RECORD_CGROUP .
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.RE
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.TP
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@ -2865,9 +2866,9 @@ This record includes various namespace information of a process.
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.EX
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struct {
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struct perf_event_header header;
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u32 pid;
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u32 tid;
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u64 nr_namespaces;
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u32 pid;
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u32 tid;
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u64 nr_namespaces;
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struct { u64 dev, inode } [nr_namespaces];
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struct sample_id sample_id;
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};
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@ -2923,11 +2924,11 @@ This record indicates kernel symbol register/unregister events.
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.EX
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struct {
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struct perf_event_header header;
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u64 addr;
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u32 len;
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u16 ksym_type;
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u16 flags;
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char name[];
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u64 addr;
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u32 len;
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u16 ksym_type;
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u16 flags;
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char name[];
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struct sample_id sample_id;
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};
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.EE
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@ -2935,18 +2936,18 @@ struct {
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.RS
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.TP
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.I addr
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is the address of the kernel symbol
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is the address of the kernel symbol.
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.TP
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.I len
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is the length of the kernel symbol
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is the length of the kernel symbol.
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.TP
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.I ksym_type
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is the type of the kernel symbol.
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Currently following types are available:
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Currently the following types are available:
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.RS
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.TP
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.B PERF_RECORD_KSYMBOL_TYPE_BPF
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The kernel symbols is a BPF function.
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The kernel symbol is a BPF function.
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.RE
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.TP
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.I flags
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@ -2985,7 +2986,7 @@ A BPF program is unloaded
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.RE
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.TP
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.I id
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is the id of the BPF program.
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is the ID of the BPF program.
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.TP
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.I tag
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is the tag of the BPF program.
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@ -3002,8 +3003,8 @@ This record indicates a new cgroup is created and activated.
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.EX
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struct {
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struct perf_event_header header;
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u64 id;
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char path[];
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u64 id;
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char path[];
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struct sample_id sample_id;
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};
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.EE
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@ -3012,7 +3013,7 @@ struct {
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.TP
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.I id
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is the cgroup identifier.
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This can be also retreived by
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This can be also retrieved by
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.BR name_to_handle_at (2)
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on the cgroup path (as a file handle).
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.TP
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@ -3030,10 +3031,10 @@ and the corresponding length is zero in this case.
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.EX
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struct {
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struct perf_event_header header;
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u64 addr;
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u16 old_len;
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u16 new_len;
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u8 bytes[];
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u64 addr;
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u16 old_len;
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u16 new_len;
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u8 bytes[];
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struct sample_id sample_id;
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};
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.EE
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