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/linux-6.15/tools/testing/selftests/powerpc/pmu/
H A Dcount_instructions.c30 u64 overhead, bool report) in do_count_loop() argument
45 expected = instructions + overhead; in do_count_loop()
76 u64 current, overhead; in determine_overhead() local
80 overhead = events[0].result.value; in determine_overhead()
85 if (current < overhead) { in determine_overhead()
87 overhead = current; in determine_overhead()
91 return overhead; in determine_overhead()
97 u64 overhead; in test_body() local
112 overhead = determine_overhead(events); in test_body()
116 FAIL_IF(do_count_loop(events, 1000000, overhead, true)); in test_body()
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H A Dcount_stcx_fail.c30 u64 overhead, bool report) in do_count_loop() argument
81 u64 current, overhead; in determine_overhead() local
85 overhead = events[0].result.value; in determine_overhead()
90 if (current < overhead) { in determine_overhead()
92 overhead = current; in determine_overhead()
96 return overhead; in determine_overhead()
105 u64 overhead; in test_body() local
129 overhead = determine_overhead(events); in test_body()
133 FAIL_IF(do_count_loop(events, 1000000, overhead, true)); in test_body()
136 FAIL_IF(do_count_loop(events, 10000000, overhead, true)); in test_body()
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/linux-6.15/tools/testing/selftests/powerpc/pmu/ebb/
H A Dinstruction_count_test.c26 uint64_t overhead, bool report) in do_count_loop() argument
46 expected = instructions + overhead; in do_count_loop()
72 uint64_t current, overhead; in determine_overhead() local
76 overhead = event->result.value; in determine_overhead()
81 if (current < overhead) { in determine_overhead()
83 overhead = current; in determine_overhead()
87 return overhead; in determine_overhead()
112 uint64_t overhead; in instruction_count() local
131 overhead = determine_overhead(&event); in instruction_count()
135 FAIL_IF(do_count_loop(&event, 0x100000, overhead, true)); in instruction_count()
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/linux-6.15/tools/perf/Documentation/
H A Dcallchain-overhead-calculation.txt3 The CPU overhead can be shown in two columns as 'Children' and 'Self'
5 wall-clock overhead). The 'self' overhead is simply calculated by
8 'self' overhead values should be 100%.
10 The 'children' overhead is calculated by adding all period values of
11 the child functions so that it can show the total overhead of the
16 It might be confusing that the sum of all the 'children' overhead
19 can find which function has the most overhead even if samples are
46 in the usual (self-overhead-only) output of perf report:
98 Likewise, the 'self' overhead of 'bar' (40%) was added to the
99 'children' overhead of 'main' and '\_\_libc_start_main'.
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H A Dcpu-and-latency-overheads.txt8 Perf can measure overhead for both of these times (shown in 'overhead' and
11 Optimizing CPU overhead is useful to improve 'throughput', while optimizing
12 latency overhead is useful to improve 'latency'. It's important to understand
20 128 seconds of CPU time). The CPU overhead is: 'foo' - 6.6%, 'bar' - 93.4%.
21 While the latency overhead is: 'foo' - 90%, 'bar' - 10%. If we try to optimize
22 running time of the program looking at the (wrong in this case) CPU overhead,
26 By default, perf shows only CPU overhead. To show latency overhead, use
38 To sort by latency overhead, use 'perf report --latency':
H A Dperf-report.txt47 the overhead and latency columns. See --percentage for more info.
57 the overhead and latency columns. See --percentage for more info.
62 the overhead and latency columns. See --percentage for more info.
116 - overhead: CPU overhead percentage of sample.
117 - latency: latency (wall-clock) overhead percentage of sample.
146 By default, overhead, comm, dso and symbol keys are used.
147 (i.e. --sort overhead,comm,dso,symbol).
302 - percent: display overhead percent (default)
456 Do not show entries which have an overhead under that percent.
540 for other events to reduce the overhead.
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H A Dperf-config.txt182 'top' means a overhead percentage which is more than 5%.
187 'medium' means a overhead percentage which has more than 0.5%.
190 'normal' means the rest of overhead percentages
435 current overhead (33.33%).
478 (meaning that it assumes 100% total overhead of 'foo').
480 The 'graph' uses absolute overhead value of 'foo' as total so each of
481 'bar' and 'baz' callchain will have 20.00% of overhead.
519 histogram entries. Entries having an overhead lower than this
521 is '10', only entries which have more than 10% of overhead will be
531 and show (accumulated) total overhead as well as 'Self' overhead.
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H A Dperf-top.txt134 local_weight, abort, in_tx, transaction, overhead, sample, period.
140 overhead, overhead_sys, overhead_us, overhead_children, sample and period.
155 percentage of the overhead column. See --percentage for more info.
159 percentage of the overhead column. See --percentage for more info.
163 percentage of the overhead column. See --percentage for more info.
199 enabled. See the `overhead calculation' section for more details.
216 Do not show entries which have an overhead under that percent.
220 Determine how to display the overhead percentage of filtered entries.
357 Alternatively one can ask for a group and then two overhead columns
435 include::callchain-overhead-calculation.txt[]
/linux-6.15/drivers/net/fddi/skfp/
H A Dess.c119 u_long payload, overhead ; in ess_raf_received_pack() local
260 payload, overhead); in ess_raf_received_pack()
313 payload, overhead); in ess_raf_received_pack()
426 if (payload > MAX_PAYLOAD || overhead > 5000) { in process_bw_alloc()
437 (u_long)overhead != smc->mib.fddiESSOverhead)) { in process_bw_alloc()
449 smc->ess.sync_bw = overhead - in process_bw_alloc()
457 overhead = 0 ; in process_bw_alloc()
520 chg->overhead.para.p_type = SMT_P3210 ; in ess_send_response()
522 chg->overhead.mib_index = SBAPATHINDEX ; in ess_send_response()
628 req->overhead.para.p_type = SMT_P3210 ; in ess_send_alc_req()
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/linux-6.15/net/sctp/
H A Doutput.c60 packet->size = packet->overhead; in sctp_packet_reset()
95 packet->overhead = sctp_mtu_payload(sp, 0, 0); in sctp_packet_config()
96 packet->size = packet->overhead; in sctp_packet_config()
155 packet->overhead = 0; in sctp_packet_init()
221 int overhead = 0; in sctp_packet_bundle_pad() local
458 pkt_size = packet->overhead; in sctp_packet_pack()
465 else if (auth_len + padded + packet->overhead > in sctp_packet_pack()
475 skb_reserve(nskb, packet->overhead + MAX_HEADER); in sctp_packet_pack()
479 pkt_size -= packet->overhead; in sctp_packet_pack()
602 skb_reserve(head, packet->overhead + MAX_HEADER); in sctp_packet_transmit()
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/linux-6.15/drivers/net/wireless/ralink/rt2x00/
H A Drt2x00crypto.c68 unsigned int overhead = 0; in rt2x00crypto_tx_overhead() local
71 return overhead; in rt2x00crypto_tx_overhead()
78 overhead += key->icv_len; in rt2x00crypto_tx_overhead()
81 overhead += key->iv_len; in rt2x00crypto_tx_overhead()
85 overhead += 8; in rt2x00crypto_tx_overhead()
88 return overhead; in rt2x00crypto_tx_overhead()
/linux-6.15/fs/freevxfs/
H A Dvxfs_lookup.c84 int overhead = VXFS_DIRBLKOV(sbi, dbp); in vxfs_find_entry() local
86 pos += overhead; in vxfs_find_entry()
87 pg_ofs += overhead; in vxfs_find_entry()
234 int overhead = VXFS_DIRBLKOV(sbi, dbp); in vxfs_readdir() local
236 pos += overhead; in vxfs_readdir()
237 pg_ofs += overhead; in vxfs_readdir()
/linux-6.15/fs/xfs/libxfs/
H A Dxfs_trans_resv.c496 unsigned int overhead = XFS_DQUOT_LOGRES; in xfs_calc_rename_reservation() local
538 return overhead + max3(t1, t2, t3); in xfs_calc_rename_reservation()
607 unsigned int overhead = XFS_DQUOT_LOGRES; in xfs_calc_link_reservation() local
620 overhead += xfs_calc_pptr_link_overhead(); in xfs_calc_link_reservation()
623 return overhead + max3(t1, t2, t3); in xfs_calc_link_reservation()
675 overhead += xfs_calc_iunlink_add_reservation(mp); in xfs_calc_remove_reservation()
685 overhead += xfs_calc_pptr_unlink_overhead(); in xfs_calc_remove_reservation()
688 return overhead + max3(t1, t2, t3); in xfs_calc_remove_reservation()
759 unsigned int overhead = XFS_DQUOT_LOGRES; in xfs_calc_icreate_reservation() local
767 overhead += xfs_calc_pptr_link_overhead(); in xfs_calc_icreate_reservation()
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/linux-6.15/net/l2tp/
H A Dl2tp_eth.c189 unsigned int overhead = 0; in l2tp_eth_adjust_mtu() local
195 overhead += sizeof(struct udphdr); in l2tp_eth_adjust_mtu()
214 overhead += session->hdr_len + ETH_HLEN + l3_overhead; in l2tp_eth_adjust_mtu()
216 mtu = l2tp_tunnel_dst_mtu(tunnel) - overhead; in l2tp_eth_adjust_mtu()
218 dev->mtu = ETH_DATA_LEN - overhead; in l2tp_eth_adjust_mtu()
/linux-6.15/include/net/sctp/
H A Dsctp.h576 __u32 overhead = sizeof(struct sctphdr) + extra; in __sctp_mtu_payload() local
579 overhead += sp->pf->af->net_header_len; in __sctp_mtu_payload()
581 overhead += sizeof(struct udphdr); in __sctp_mtu_payload()
583 overhead += sizeof(struct ipv6hdr); in __sctp_mtu_payload()
586 if (WARN_ON_ONCE(mtu && mtu <= overhead)) in __sctp_mtu_payload()
587 mtu = overhead; in __sctp_mtu_payload()
589 return mtu ? mtu - overhead : overhead; in __sctp_mtu_payload()
/linux-6.15/fs/ext4/
H A Dresize.c109 ext4_grpblk_t overhead; in ext4_group_overhead_blocks() local
112 overhead += 1 + in ext4_group_overhead_blocks()
114 return overhead; in ext4_group_overhead_blocks()
129 unsigned overhead; in verify_group_input() local
317 unsigned overhead; in ext4_alloc_group_tables() local
337 start_blk += overhead; in ext4_alloc_group_tables()
343 if (overhead == 0) in ext4_alloc_group_tables()
387 itb -= overhead; in ext4_alloc_group_tables()
561 ext4_grpblk_t overhead; in setup_new_flex_group_blocks() local
647 if (overhead != 0) { in setup_new_flex_group_blocks()
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/linux-6.15/Documentation/driver-api/mmc/
H A Dmmc-async-req.rst8 How significant is the cache maintenance overhead?
11 pre-fetch makes the cache overhead relatively significant. If the DMA
13 transfer, the DMA preparation overhead would not affect the MMC performance.
75 Pseudocode to handle is_first_req scenario with minimal prepare overhead::
/linux-6.15/Documentation/virt/
H A Dparavirt_ops.rst25 known that the overhead of indirect call isn't very important.
29 are called frequently and are performance critical. The overhead is
/linux-6.15/Documentation/usb/
H A Dohci.rst20 - improved robustness; bugfixes; and less overhead
30 to overhead in IRQ processing. When interrupt transfers are queued, those
/linux-6.15/net/mac80211/
H A Dairtime.c508 u32 *overhead) in ieee80211_get_rate_duration() argument
579 *overhead = 36 + (streams << 2); in ieee80211_get_rate_duration()
590 u32 duration, overhead = 0; in ieee80211_calc_rx_airtime() local
613 duration = ieee80211_get_rate_duration(hw, status, &overhead); in ieee80211_calc_rx_airtime()
621 return duration + overhead; in ieee80211_calc_rx_airtime()
781 u32 duration, overhead; in ieee80211_calc_expected_tx_airtime() local
790 duration = ieee80211_get_rate_duration(hw, &stat, &overhead); in ieee80211_calc_expected_tx_airtime()
816 duration += (overhead >> agg_shift); in ieee80211_calc_expected_tx_airtime()
H A Drc80211_minstrel_ht.c503 unsigned int nsecs = 0, overhead = mi->overhead; in minstrel_ht_get_tp_avg() local
511 overhead = mi->overhead_legacy; in minstrel_ht_get_tp_avg()
515 nsecs = 1000 * overhead / ampdu_len; in minstrel_ht_get_tp_avg()
1391 unsigned int overhead = 0, overhead_rtscts = 0; in minstrel_calc_retransmit() local
1413 overhead = mi->overhead_legacy; in minstrel_calc_retransmit()
1416 overhead = mi->overhead; in minstrel_calc_retransmit()
1421 tx_time = ctime + 2 * (overhead + tx_time_data); in minstrel_calc_retransmit()
1431 tx_time += ctime + overhead + tx_time_data; in minstrel_calc_retransmit()
1729 mi->overhead = ieee80211_frame_duration(sband->band, 0, 60, 1, 1); in minstrel_ht_update_caps()
1730 mi->overhead += ack_dur; in minstrel_ht_update_caps()
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/linux-6.15/drivers/net/fddi/skfp/h/
H A Dsmt.h799 struct smt_p_3210 overhead ; /* current SBA overhead */ member
816 struct smt_p_3210 overhead ; /* current SBA overhead */ member
832 struct smt_p_3210 overhead ; /* current SBA overhead */ member
854 struct smt_p_3210 overhead ; /* current SBA overhead */ member
/linux-6.15/Documentation/mm/damon/
H A Dindex.rst13 - *light-weight* (the monitoring overhead is low enough to be applied online),
15 - *scalable* (the upper-bound of the overhead is in constant range regardless
/linux-6.15/Documentation/filesystems/ext4/
H A Dbigalloc.rst11 blocks to reduce both fragmentation and metadata overhead. The
23 also shrinking the amount of file system overhead for metadata.
/linux-6.15/fs/netfs/
H A DKconfig19 The gathering of statistics adds a certain amount of overhead to
54 The gathering of statistics adds a certain amount of overhead to

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